Acute toxicity of peroxy sulfonated oleic acids (PSOA) to freshwater aquatic species and sludge microflora as observed in laboratory environments.

Stephan Solloch,Bridget Peterson,Jeffrey Caudill,Magdalena Osorio,Nathan Pechacek

doi:10.1186/s12302-015-0054-5

Stephan Solloch, Bridget Peterson + Show 3 more

Open Access

https://doi.org/10.1186/s12302-015-0054-5

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Abstract

BackgroundPeroxy sulfonated oleic acids (PSOA) is a novel surfactant peracid. The commercial applications of PSOA result in the chemical primarily being disposed of via industrial waste water effluent. Given this manner of disposal, it is important to understand the aquatic hazards of the chemical to better assess the risk posed to aqueous environments. Acute aquatic toxicity laboratory experiments were performed to evaluate aquatic hazards and were conducted according to standard OECD test guidelines with rainbow trout (Oncorhynchus mykiss), water fleas (Daphnia magna) and algae (Pseudokirchneriella subcapitata). In addition, microbial toxicity was evaluated in activated sludge obtained from a domestic sewage treatment facility.Results Lethal concentration in 50 % of test species (LC50) and effect concentration in 50 % of test species (EC50) values for PSOA ranged from 0.75 to 5.44 mg/L, representing a relatively small range spanning less than an order of magnitude. No observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) ranges were also relatively small, with ranges of 0.25–1.66 and 0.5–3.6 mg/L, respectively. The EC50, LOEC and NOEC values for microbial toxicity were 216, 60 and 20 mg/L, respectively. Predicted no effect concentrations (PNEC) for aqueous media were based on the 96-h LC50 (0.75 mg/L) for O. mykiss, the organism displaying the greatest sensitivity to PSOA. These values were derived for freshwater, marine water and intermittent releases to water and ranged from 7.5 × 10−5 to 7.5 × 10−3 mg/L. A sewage treatment plant PNEC of 2 mg/L was derived based on an activated sludge 3-h NOEC of 20 mg/L.ConclusionThese values, along with the anticipated environmental fate and transport for PSOA, were considered in assessing the overall aquatic risk posed by this chemical. Despite the relatively high acute aquatic hazards for PSOA, environmental modeling suggests the overall risk of PSOA to aqueous environments is low based on its anticipated uses. This conclusion is consistent with the significant processing of industrial wastewater by onsite or municipal wastewater treatment facilities prior to release to the environment.

Highlights

Peroxy sulfonated oleic acids (PSOA) is a novel surfactant peracid
It rapidly decomposes when dried on a surface due to the water loss that shifts the equilibrium of the PSOA mixture [7]
PSOA is a novel surfactant peracid whose commercial use will result in disposal via industrial wastewater effluent

Summary

Introduction

Peroxy sulfonated oleic acids (PSOA) is a novel surfactant peracid. Due to the variability inherent in the natural feedstock used to obtain oleic acid, PSOA subsequently falls into the regulatory definition of an unknown or variable composition, complex reaction products or biological materials (UVCB) substance [5, 13]. PSOA is a novel surfactant peracid developed to alleviate challenges with current peracid technology. It is commercially used as an antimicrobial, bleaching or coupling agent. When PSOA comes into contact with organic matter such as milk or blood, it rapidly decomposes to its precursor reactants It rapidly decomposes when dried on a surface due to the water loss that shifts the equilibrium of the PSOA mixture [7]. It is hydrolytically unstable and significant hydrolysis occurs at environmentally relevant pH values (4, 7 and 9) [2]

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