Determination Of Peracetic Acid Research Articles

Determination of peracetic acid in the presence of hydrogen peroxide based on the catalytic oxidation of ABTS

Determination of the concentration of peracetic acid (PAA) in the presence of H2O2 is a great challenging problem due to the similar chemical behaviors of the two species. In this study, we developed a new method for simultaneous measurement of PAA (0.5 – 10.0 μM) and total peroxides (i.e., PAA and H2O2 with a molar ratio of 10:6.5), based on the catalytic oxidation of ABTS by separately using Co(II) and peroxidase (POD) as the catalysts. Owing to the unique catalytic activity of Co(II) towards PAA, the coexistent H2O2 exhibits negligible effect on the determination of PAA. The value of absorbance at 415 nm increases linearly with increasing the concentration of PAA or total peroxides, and the sensitivities for PAA and total peroxides are as high as 5.31 × 104 and 9.07 × 104 M−1 cm−1, respectively. In addition, the proposed ABTS method shows excellent feasibility and applicability, which make it suitable to be employed for detection in complicated water matrices.

Determination of peracetic acid by an Ag nanoparticle decorated Cu-organic framework modified electrode

Peracetic acid (PAA) is commonly used as the strong oxidant in many areas. However, high concentration of PAA can be harmful to health of people. The quantitative determination of PAA is of great significance. Here, a metal–organic framework (MOF) is introduced into the electrochemical sensor for PAA detection. The influence of common transition metal centers on the performance of electrochemical detection of PAA was investigated and the results showed the Cu-1,3,5-trimesic acid (Cu-BTC) was the best original MOF. Ag nanoparticles were decorated in the Cu-BTC to further improve the electrocatalytical activity. The concentration of the added Ag salt and the quality of the reducing agent tannic acid (TA) had a great impact on the performance. The final sample optimized for the synthesis conditions was named as Ag NPs/Cu-BTC. The electrochemical sensor based on Ag NPs/Cu-BTC/GCE was fabricated for sensing PAA with a wide linear range (0.1–5000 μM), low detection limit (0.046 μM, S/N = 3) and high sensitivity (1013.4 μA mM−1 cm−2). The water stability of Ag NPs/Cu-BTC and the anti-interference ability of the sensor were good. The electrochemical sensor could be applied in detecting the concentration of PAA in the commercially available peracetic acid, suggesting the practical application value.

Determination of Peracetic Acid in the Presence of Hydrogen Peroxide Based on the Catalytic Oxidation of ABTS

Determination of Peracetic Acid in the Presence of Hydrogen Peroxide Based on the Catalytic Oxidation of ABTS

Sufficient Penetration of Peracetic Acid into Drilled Human Femoral Heads

Chemical sterilisation methods for musculoskeletal transplants have the problem of penetration into all tissue strata. The present study examined if a peracetic acid/ethanol solution penetrated to a sufficient extent into specifically prepared femoral heads. To this effect, 10 femoral heads have been provided with drillings (diameter 2 mm, depth 10 mm) at a distance of 15 mm (series B) and placed in a diffusion chamber with sterilisation solution. From an additional central drilling at the femoral neck junction, the sample drawing was made after 30 min each over a period of 4 h for the iodometric determination of peracetic acid (PAA) concentration. Ten femoral heads, which did contain only the central drilling, served as controls (series A). In 9 of the examined femoral heads of series A the defined minimum concentration of PAA of 0.2% (inactivation of bacteria, spores, fungi) has been clearly exceeded over the complete period of measurement. About 0.8% PAA (inactivation of viruses) was achieved within 4 h only with six femoral heads. Nine out of the 10 examined femoral heads in series B show a clearly improved penetration behaviour which was expressed in smaller standard deviations, a faster increase in concentration, as well as in higher starting and final concentrations (approx. 0.9%) of PAA. Previous drying in air leads to a faster penetration into the centre of the bone. Standardised drilling of de-cartilaged femoral heads creates favourable conditions for the penetration of the PAA sterilisation solution into the whole tissue and guarantees a sufficient inactivation of microorganisms.