Concentrations Of Carbonyl Compounds Research Articles

Indoor Air Quality Analysis of Newly Built Houses.

Recently, people have become increasingly aware of potential health issues related to indoor environments. In this study, we measure the concentrations of various volatile organic compounds, carbonyl compounds, and semi-volatile organic compounds, as well as the ventilation rates, in 49 new houses with light-gauge steel structures one week after completion. The proper indoor air quality of new residential environments can be ensured by characterizing people’s exposure to certain chemicals and assessing future risks. Our results show that the concentrations of the measured compounds were lower than the guideline values set by the Ministry of Health, Labour and Welfare of Japan, and would continue to decrease. However, we observed that unregulated compounds, assumed to be substitutes for regulated solvents, contributed substantially to the total volatile organic compounds. To reduce indoor chemical exposure risks, the concentrations of these unregulated compounds should also be minimized. In addition, their sources need to be identified, and manufacture and use must be monitored. We believe it is important to select low-emission building materials for reducing residents’ exposure to indoor chemicals.

The Characteristics of Carbonyl Compounds Emissions from Small Marine Diesel Engines Using Biodiesel Based Palm Oil

The study was conducted to measure and evaluate particulate emissions and carbonyl compounds from KAMA - KDE3500T generator at medium load mode (1.5 kW load). Using commercial diesel fuel 0.05 S and biodiesel palm oil with different mixing ratios are: 0%, 10%, 20%, 30%, 50%, 75% and 100% for B0, B10, B20, B30, B50, B75 and B100. Experimental results showed that: dust emission concentration decreased from B0 to B20 and increased from B30 to B100 namely 348.65 mg / m3, 297.27 mg / m3, 168.59 mg / m3, 169.74 mg / m3, 259.98 mg / m3, 330.30 mg / m3, 522.98 mg / m3 respectively for B0, B10, B20, B30, B50, B75, B100. Carbonyl emission concentrations increased from B0 to B30 and abruptly decreased at B50 and gradually increased at B75 and B100 specific figures as follows: 67.99 mg / m3, 87.35 mg / m3, 99.10 mg / m3, 100.96 mg / m3, 65.79 mg / m3, 102.32 mg / m3, 102.38 mg / m3 respectively for B0, B10, B20, B30, B50, B75 and B100. High concentrations of carbonyl compounds are formaldehyde, acetaldehyde and acetone.

The Characteristics of Carbonyl Compounds Emissions from Small Marine Diesel Engines Using Biodiesel Based Palm Oil

The study was conducted to measure and evaluate particulate emissions and carbonyl compounds from KAMA - KDE3500T generator at medium load mode (1.5 kW load). Using commercial diesel fuel 0.05 S and biodiesel palm oil with different mixing ratios are: 0%, 10%, 20%, 30%, 50%, 75% and 100% for B0, B10, B20, B30, B50, B75 and B100. Experimental results showed that: dust emission concentration decreased from B0 to B20 and increased from B30 to B100 namely 348.65 mg / m3, 297.27 mg / m3, 168.59 mg / m3, 169.74 mg / m3, 259.98 mg / m3, 330.30 mg / m3, 522.98 mg / m3 respectively for B0, B10, B20, B30, B50, B75, B100. Carbonyl emission concentrations increased from B0 to B30 and abruptly decreased at B50 and gradually increased at B75 and B100 specific figures as follows: 67.99 mg / m3, 87.35 mg / m3, 99.10 mg / m3, 100.96 mg / m3, 65.79 mg / m3, 102.32 mg / m3, 102.38 mg / m3 respectively for B0, B10, B20, B30, B50, B75 and B100. High concentrations of carbonyl compounds are formaldehyde, acetaldehyde and acetone.

Reactive carbonyl compounds, carbonyl stress, and neuroinflammation in methyl alcohol intoxication

Methyl alcohol intoxications are characterized by high lethality and high prevalence of serious visual and brain damage in survivors. The mechanisms of toxic brain damage are complex and the role of carbonyl stress has not been studied yet. We measured the acute and follow-up concentrations of reactive carbonyl compounds in patients with acute methyl alcohol intoxication. Blood samples were collected from 28 subjects hospitalized with confirmed methyl alcohol intoxication and from 36 subjects who survived poisoning 2 years after discharge. Serum concentrations of C6–12 reactive aldehydes were measured by liquid chromatography–electrospray ionization–tandem mass spectrometry. The acute concentrations of all measured reactive aldehydes were higher than the follow-up concentrations: 36.4 ± 4.8 vs. 21.6 ± 5.2 ng cm−3 for C6; 38.9 ± 5 vs. 17.0 ± 2.0 ng cm−3 for C7; 18.8 ± 3.9 vs. 4 ± 0 cm−3 for C8; 36.5 ± 3.9 vs. 19.0 ± 3.0 ng cm−3 for C9; 6.1 ± 0.4 vs. 4.0 ± 0.5 ng cm−3 for C10; 13.6 ± 3.0 vs. 3.7 ± 0.6 ng cm−3 for C11; and 7.8 ± 0.4 vs. 4.7 ± 0.4 ng cm−3 for C12 (all p < 0.001). The patients who survived the intoxication had higher concentration of reactive carbonyl compounds than those who died: 38.6 ± 5.9 vs. 28.3 ± 1.7 ng cm−3 for C6 (p = 0.002); 20.7 ± 4.7 vs. 11.8 ± 1.2 ng cm−3 for C8 (p = 0.001); 37.7 ± 4.8 vs. 31.8 ± 3.8 ng cm−3 for C9 (p = 0.042); and 7.9 ± 0.6 vs. 7.3 ± 0.5 ng cm−3 for C12 (p = 0.022). A significant association was present between severity of metabolic acidosis, anion gap, and the acute concentration of measured biomarkers: r = − 0.39; p = 0.046 for C6; r = − 0.42; p = 0.035 for C7; r = − 0.48; p = 0.012 for C8; r = − 0.39; p = 0.046 for C9; and r = − 0.47; p = 0.015 for C11. The acute concentration of C6–C12 reactive aldehydes positively correlated with the acute serum concentration of leukotrienes (all p < 0.05). Acute elevation of serum concentration of reactive carbonyl compounds suggests that carbonyl stress is involved in the mechanisms of leukotriene-mediated neuroinflammatory response to methyl alcohol-induced toxic brain damage.

Effect of milk proteins and food-grade surfactants on oxidation of linseed oil-in-water emulsions during in vitro digestion

Health benefits are associated with polyunsaturated fatty acids, but their sensitivity to oxidation may generate toxic oxidation species. The objective of this study was to compare the effect of milk proteins (casein, whey protein) and surfactants (Citrem, Tween 20) on the in vitro digestion and oxidation of linseed oil emulsions. The emulsion produced with Tween 20 resisted coalescence in the gastric phase and showed the highest concentrations of free fatty acids and reactive carbonyl compounds in the intestinal digestion phase. The Citrem-stabilized emulsion showed extensive coalescence in the gastric environment, which reduced lipolysis and the formation of advanced oxidation species. The protein-stabilized emulsions showed aggregation with some coalescence in the gastric phase, and casein provided better protection than whey protein against oxidation. This study suggests that the mechanism of emulsion destabilization in the gastric environment and the type of protein can modulate lipolysis and oxidation during in vitro digestion.

Emission of Carbonyl Compounds from Cooking Oil Fumes in the Night Market Areas

ABSTRACT Cooking oil fumes (CF) coming from night market stalls exhaust contain substantial amounts of air pollutants such as carbonyl compounds that may contribute to outdoor air pollution and may have adverse health effects on the Taiwanese population. Carbonyl emission characteristics depend on several factors, which include but are not limited to, the cooking style and food material being used. The current study evaluated carbonyl compound emissions from two scenarios: a standard kitchen cooking classroom with a stack gas tunnel and night market food stalls. The different cooking styles and food types cooked using a liquefied petroleum gas (LPG) stove, such as grilled chicken with (GCS) and without sauce (GC), mixed barbecue with sauce (MBS), grilled vegetables with sauce (GVS), stir-fried oyster omelet (OM), fried Taiwanese chicken nuggets (FN) in the kitchen cooking classroom, and grilled chicken with (GCS) and without sauce (GC), stir-fried oyster omelet (OM), grilled vegetables with sauce (GVS), and fried steak (FS) in the night market were evaluated for carbonyl carbon emissions. OM from the kitchen classroom and GCS from the night market showed the highest mean total carbonyl compound concentrations (1850 ± 682 ppb and 1840 ppb). Formaldehyde was found to be the most predominant carbonyl compound, with contribution percentages ranging from 70.9–99.58% of the total carbonyl emission factors in CFs. Grilled vegetables with sauce had the highest emission factor magnitude of 274 µg kg–1 wt. Factors such as the addition of sauce and grilling were also observed to increase carbonyl compound emissions. Corresponding health risks of carbonyl compounds in CFs for the night market vendors were also assessed. All values for cancer risk (R) were above the standard R value for workplace exposure, and HQ values were all greater than 1, suggesting a high risk for adverse health effects. Although our reported values were relatively high due to our sampling conditions, our study was first to be conducted in Taiwan and holds an important contribution to the global existing data of carbonyl compound emissions.

Effect of Titanium Dioxide on Secondary Organic Aerosol Formation.

Secondary organic aerosol (SOA), a dominant air pollutant in many countries, threatens the lives of millions of people. Extensive efforts have been invested in studying the formation mechanisms and influence factors of SOA. As promising materials in eliminating air pollutants, the role of photocatalytic materials in SOA formation is unclear. In this study, TiO2 was employed to explore its impact on SOA formation during the photooxidation of m-xylene with NO x in a smog chamber. We found that the presence of TiO2 strongly suppressed SOA formation. The yields of SOA in the photooxidation experiments of m-xylene with NO x were 0.3-4%, whereas negligible SOA was formed when TiO2 was added. When ((NH4)2SO4) was introduced as seed particles, the presence of TiO2 decreased the yields of SOA from 0.3-6% to 0.3-1.6%. The sharply decreased concentrations of reactive carbonyl compounds were the direct cause of the suppression effect of TiO2 on SOA formation. However, the suppression effect was influenced by the addition of seed particles and the initial concentration of NO x. Reaction mechanisms of the photocatalysis of m-xylene with and without NO x were proposed.

Gas-Particle Partitioning of Carbonyl Compounds in the Ambient Atmosphere

Despite their crucial roles in health and climate concerns, the gas-particle partitioning of carbonyl compounds is poorly characterized in the ambient atmosphere. In this study, we investigate their partitioning by simultaneously measuring six carbonyl compounds (formaldehyde, acetaldehyde, acetone, propionaldehyde, glyoxal, and methylglyoxal) in the gas and particle phase at an urban site in Beijing. The field-derived partitioning coefficients ( Kpf) are in the range of 10-5-10-3 m3 μg-1, and the corresponding effective Henry's law coefficients ( KHf) should be 107-109 M atm-1. The Pankow's absorptive partitioning theory and Henry's law both significantly underestimate concentrations of particle-phase carbonyl compounds (105-106 times and >103 times, respectively). The observed "salting-in" effects only partially explain the enhanced partitioning to particles, which is approximately 1 order of magnitude. The measured Kpf values are higher at low relative humidity, and the overall effective vapor pressure of these carbonyl species are lower than their hydrates, indicating that carbonyl oligomers potentially formed in highly concentrated particle phase. The reaction kinetics of oligomer formation should be included if applying Henry's law to low-to-moderate relative humidity, and the high partitioning coefficients observed need to be proved by further field and laboratory studies. These findings provide deeper insights into the formation of carbonyl secondary organic aerosols in the ambient atmosphere.

Discrimination between virgin and recycled polystyrene containers by Fourier transform infrared spectroscopy and principal component analysis

A rapid and reliable method for discriminating virgin and recycled expanded polystyrene (EPS) containers was developed using Fourier transform infrared spectroscopy combined with principal component analysis. Standard normal variate, first and second‐order derivative spectra were compared for the discrimination results. The results show that carbonyl region (1780‐1620 cm−1) spectra using first derivative transformation give the optimum classification results. In addition, the carbonyl compounds in EPS containers were detected to clarify the chemical difference between virgin and recycled containers, with a higher concentration of carbonyl compounds observed in recycled EPS containers. The combination of carbonyl region of Fourier transform infrared spectroscopy with chemometrics proved to be a promising method to discriminate virgin and recycled EPS containers, which could function as an additional tool for quality control of plastics.

Determination of eight carbonyl compounds in aerosols trapped in phosphate buffer saline solutions to support in vitro assessment studies

When investigating the toxicological impact of aerosols using in vitro systems like cell cultures, it is essential to have a quantitative measurement of the chemicals that the cells are exposed to.Carbonyl compounds represent an important class of marker compounds for in vitro and in vivo exposure to different toxicological agents, including cigarette smoke (CS). A new LC-MS/MS method that quantifies eight of these analytes in aerosols trapped in phosphate-buffered saline solutions has been developed to measure exposure. During the method development phase, particular attention has been paid to the efficient derivatization of the target compounds in the trapped aerosols and to avoid the formation of poly-derivatized molecules, which could lead to inaccurate quantifications.The method has been successively validated using the accuracy profile procedure. Selectivity, detection limits, precision, and accuracy have been evaluated for Vitrocell®, Gas Vapor Phase (GVP), and Whole Smoke (WS) matrices of smoke generated by 3R4F cigarettes and aerosol generated by the Tobacco Heating System (THS) 2.2, a heat-not-burn tobacco product developed by Philip Morris International (Smith et al., 2016) [1]. Validation results confirmed that the established working ranges also allow the analysis of THS aerosols, where the concentrations of carbonyl compounds are substantially lower than those generated by 3R4F cigarettes. Moreover, data gathered on 3R4F aerosol samples trapped with DNPH in acetonitrile solutions have been compared to the quantification given by an in-house UHPLC-MS/MS and reference values from the literature.

Study on air concentrations of lower carbonyl compounds in household refrigerators

Study on air concentrations of lower carbonyl compounds in household refrigerators

Glycation, Glycolysis, and Neurodegenerative Diseases: Is There Any Connection?

This review considers the interrelation between different types of protein glycation, glycolysis, and the development of amyloid neurodegenerative diseases. The primary focus is on the role of the glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase in changing the concentration of carbonyl compounds - first and foremost, glyceraldehyde-3-phosphate and methylglyoxal. It has been suggested that various modifications of the enzyme - from the oxidation of the sulfhydryl groups of the active site to glycation with sugars- can lead to its inactivation, which causes a direct increase in glyceraldehyde-3-phosphate concentration and an indirect increase in the content of other aldehydes. This "primary inactivation" of glyceraldehyde-3-phosphate dehydrogenase promotes its glycation with aldehydes, including its own substrate, and a further irreversible decrease in its activity. Such a cycle can lead to numerous consequences- from the induction of apoptosis, which is activated by modified forms of the enzyme, to glycation of amyloidogenic proteins by glycolytic aldehydes. Of particular importance during the inhibition of glyceraldehyde-3-phosphate dehydrogenase is an increase in the content of the glycating compound methylglyoxal, which is much more active than reducing sugars (glucose, fructose, and others). In addition, methylglyoxal is formed by two pathways - in the cascade of reactions during glycation and from glycolytic aldehydes. The ability of methylglyoxal to glycate proteins makes it the main participant in this protein modification. We consider the effect of glycation on the pathological transformation of amyloidogenic proteins and peptides - β-amyloid peptide, α-synuclein, and prions. Our primary focus is on the glycation of monomeric forms of these proteins with methylglyoxal, although most works are dedicated to the analysis of the presence of "advanced glycation end products" in the already formed aggregates and fibrils of amyloid proteins. In our opinion, the modification of aggregates and fibrils is secondary in nature and does not play an important role in the development of neurodegenerative diseases. The glycation of amyloid proteins with carbonyl compounds can be one of the triggers of their transformation into toxic forms. The possible role of glycation of amyloidogenic proteins in the prevention of their modification by ubiquitin and the SUMO proteins due to a disruption of their degradation is separately considered.

Seasonal evaluation of disinfection by-products throughout two full-scale drinking water treatment plants

Carbonyl compounds can occur alpha-hydrogens or beta-diketones substitution reactions with disinfectants contributed to halogenated by-products formation. The objective of this research was to study the occurrence and fate of carbonyl compounds as ozonation by-products at two full-scale drinking water treatment plants (DWTPs) using different disinfectants for one year. The quality of the raw water used in both plants was varied according to the season. The higher carbonyl compounds concentrations were found in raw water in spring. Up to 15 (as the sum of both DWTPs) of the 24 carbonyl compounds selected for this work were found after disinfection. The dominant carbonyl compounds were formaldehyde, glyoxal, methyl-glyoxal, fumaric, benzoic, protocatechuic and 3-hydroxybenzoic acid at both DWTPs. In the following steps in each treatment plant, the concentration patterns of these carbonyl compounds differed depending on the type of disinfectant applied. Benzaldehyde was the only aromatic aldehyde detected after oxidation with ozone in spring. As compared with DWTP 1, five new carbonyl compounds were formed (crotonaldehyde, benzaldehyde, formic, oxalic and malonic acid) disinfection by ozone, and the levels of the carbonyl compounds increased. In addition, pre-ozonation (PO) and main ozonation (OZ) increased the levels of carbonyl compounds, however coagulation/flocculation (CF), sand filtration (SF) and granular activated carbon filtration (GAC) decreased the levels of carbonyl compounds.

Changes in the Concentration of Carbonyl Compounds during the Alcoholic Fermentation Process Carried out with Saccharomyces cerevisiae Yeast.

The aim of the study was to determine the influence of the source material and the applied S. cerevisiae strain on the concentrations of carbonyl fractions in raw spirits. Acetaldehyde was the most common aldehyde found, as it accounted for 88-92% of the total amount of aldehydes. The concentration of acetaldehyde in maize, rye and amaranth mashes was highly correlated with fermentation productivity at a given phase of the process, and reached its highest value of 193.5 mg/l EtOH in the first hours of the fermentation, regardless of the yeast strain applied. The acetaldehyde concentration decreased over the time with the decreasing productivity, reaching its lowest value at the 72nd hour of the process. The final concentration of acetaldehyde depended on the raw material used (ca 28.0 mg/l EtOH for maize mashes, 40.3 mg/l EtOH for rye mashes, and 74.4 mg/l EtOH for amaranth mashes). The effect of the used yeast strain was negligible. The overall concentration of the analyzed aldehydes was only slightly higher: ca 30.3 mg/l EtOH for maize mashes, 47.8 mg/l EtOH for rye mashes, and 83.1 mg/l EtOH for amaranth mashes.

How the Atmosphere over Eastern Himalaya, India is Polluted with Carbonyl Compounds? Temporal Variability and Identification of Sources

ABSTRACTA study was conducted on atmospheric carbonyl compounds for the first time over a Himalayan atmosphere in India. Samples were collected from a high altitude hill station, Darjeeling (27.01°N, 88.15°E, 2200 masl) during June 2012 to May 2013. Temporal variation, meteorological influence, source apportionment and ozone formation potential etc were studied for acetaldehyde, formaldehyde, acetone, butanaldehyde, propanaldehyde, benzaldehyde, crotonaldehyde, valeraldehyde, isovaleraldehyde, hexanaldehyde, p-tolualdehyde and o-tolualdehyde. High concentration of Acetone (81.6 ± 63.5 µg m–3) was observed which could be due to the higher photochemical production from its precursor volatile organic compounds emitted from tea plants and tea processing units. The concentration of acetaldehyde (20.7 ± 47.6 µg m–3) and formaldehyde (11.6 ± 16.3 µg m–3) were found to be comparable with metro cities of India and world. The average annual concentration of total carbonyl compounds was 174.2 ± 184.6 µg m–3 with maximum during postmonsoon (456.9 ± 199.5 µg m–3) and minimum during winter season (72.2 ± 42.9 µg m–3). Meteorological parameters like temperature and surface reaching solar radiative flux played the major roles for the seasonal variation of the carbonyl concentration over the hill station. The average ratio of formaldehyde to acetaldehyde over Darjeeling was found to be 1.64 ± 1.43 well representing a typical urban atmosphere at this part of Himalaya. Positive matrix factorization model showed that the biogenic emissions from tea plants and vehicular emissions were the major sources of carbonyl compounds over the hill station.

Identification of compounds that contribute to trigeminal burn in aqueous ethanol solutions

The influence of carbonyl species on the trigeminal burn of distilled spirit model systems was investigated. Quantities of the intrinsic carbonyl compounds were significantly altered in 40% ethanol solutions using two methods; (1) increasing or decreasing the product pH, to induce hemiacetal formation and acetal stabilization or induce and stabilize carbonyl species such as aldehydes, respectively and (2) utilizing a sulfonyl hydrazine polymer treatment. Samples with reduced carbonyl concentrations had significantly lower perceived trigeminal burn intensity. Sensory recombination experiments revealed that addition of carbonyl compounds increased trigeminal burn perception in model systems; confirming the direct relationship between the concentration of carbonyl compounds and trigeminal burn. The strongest potentiators of the trigeminal response were carbonyl compounds octanal, nonanal, benzaldehyde and 2-heptanone suggesting the probability that carbonyl species such as saturated aldehydes and ketones act as agonists to activate nociceptors such as TRPV1 and TRPA1 and elicit trigeminal burn.

Characterization of the variation of carbonyl compounds concentrations before, during, and after the renovation of an apartment at Niterói, Brazil.

The present work reports the variation of 31 carbonyl compounds (CC) in an apartment located at Niterói City, Rio de Janeiro State, Brazil. Eight sampling campaigns were conducted through a 1-year period, and three areas (living room, kitchen, and bedroom) were evaluated before, during, and after the renovation activities and reoccupation of the apartment. Samples were collected using SEP-PAK cartridges impregnated with 2,4-dinitrophenylhydrazine, and the hydrazones were analyzed using rapid resolution liquid chromatography with UV detection. The lowest total concentration of CC (19.0 ± 1.5μgm(-3)) was found before the renovation when the apartment was empty, but door varnishing resulted in highest contamination of the apartment (1386 ± 384μgm(-3)); however, an important dispersion of CC was observed in the subsequent sampling (148 ± 1.8μgm(-3)). After apartment reoccupation, the indoor contamination seemed to depend on the routine activities taken there, such as household product use and cooking activities, but apparently, local temperature increase favored the vaporization of the volatile CC from the building materials in the apartment. As far as we are concerned, this is the first study comparing the concentrations of 31 CC in residential areas before, during, and after renovation activities taken in Brazil.

Colour-related phenolics, volatile composition, and sensory profile of Nero di Troia wines treated with oak chips or by micro-oxygenation

The changes of Nero di Troia wines submitted to micro-oxygenation or treatment with oak chips were studied. Oak chips favoured polymerization reactions (SPP, LPP, I HCl, polymeric phenols, and polymeric pigments, respectively +28, +67, +44, +60, and +73 % in comparison with the untreated wines, 12 months after racking). The polymerization reactions increased colour stability (colour intensity, and % of red and blue colour of the oak-treated wines were +11, +2, and +10 % compared to the control). At the end of ageing, the oak-treated wines had the highest concentrations of alcohols, carbonyl compounds, and lactones, while the highest contents of acids and esters were detected in the micro-oxygenated wines. The sensory profile of the oak-treated wines was characterized by the attenuation of floral, fruity, and vinous attributes. Concerning the phenolic profile, micro-oxygenated wines showed the highest concentrations of anthocyanins (+23 % respect to the untreated samples and +306 % respect to the oak-treated ones) and of flavan-3-ols (+24 % respect to the untreated samples and +95 % respect to the oak-treated ones). Micro-oxygenation reduced astringency and herbaceous character and intensified spicy and fruity flavours.

Emission evaluation of a diesel engine generator operating with a proportion of isobutanol as a fuel additive in biodiesel blends

Isobutanol is one of the next-generation biofuels that may potentially help to relieve the energy crisis and environmental problems. This study investigates the emissions of carbonyl compounds and regulated pollutants that are produced from diesel engine combustion in idle mode. Varied mixtures of diesel, biodiesel (up to 40 vol.%), and isobutanol (10 vol.%) components are compared with premium diesel fuels in terms of their combustion emissions. Experimental results indicate that major carbonyls in the exhaust, in order, are formaldehyde, acetaldehyde, and acrolein, and they account for 77.7% to 83.8% of the total carbonyl compound concentrations emitted from a diesel engine fueled with all test fuels including diesel. With the increase of the biodiesel proportion in the blends of diesel–biodiesel–isobutanol, carbon monoxide (CO), nitrogen oxide (NOX), and particulate matters (PMs) are decreased by an average of 3.45, 32.5, and 38.5 vol.%, respectively. The effect of the biodiesel proportion in the blends on carbonyl emissions is significant due to the fact that formaldehyde and acetaldehyde are able to be reduced by 14.4 to 54.5 vol.% in average, respectively. Although the blended fuels benefit pollutant emissions, an increase of brake specific fuel consumption is observed with an elevated percentage of biodiesel.

Comparison of carbonyl compound emissions from a diesel engine generator fueled with blends of n-butanol, biodiesel and diesel

Biodiesel can be produced from animal fats or vegetable oils with methanol or ethanol as the catalyst via transesterification. Although blends of biodiesel/diesel/alcohol are well known in emission reduction, butanol has been recently found to have economic and sustainable potentials as a substitute for ethanol in diesel blends. This study investigates the emissions of CBCs (carbonyl compounds) and regulated traditional pollutants that are produced from diesel engine combustion in idle mode. Diesel/biodiesel mixtures and diesel/biodiesel/butanol blends are compared with premium diesel fuels in terms of their emissions. Experimental results indicate that formaldehyde and acetaldehyde are the primary and secondary carbonyls in the exhaust, which account for 76.0–57.2 vol.% of total CBC concentrations for all test fuels (including diesel). We demonstrate that using B10W30 and B10W40 as alternative fuels significantly decreases FOR (formaldehyde) concentrations by 16.6 and 20.1 vol.%, respectively. It is also found out that using B10W40 instead of D100 is able to reduce particulate matter (PM) and nitrogen oxide (NOx) by 31.9 and 57.1 vol.%, respectively. Moreover, adding 10 vol.% butanol in biodiesel blends results in a decrease of FOR (formaldehyde) and ACE (acetaldehyde) formation. A decrease in FOR and ACE concentrations is proportional to the butanol–biodiesel content in the blends.