2021
DOI: 10.1021/acs.est.1c05583
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Biodegradation Kinetics of Fragrances, Plasticizers, UV Filters, and PAHs in a Mixture─Changing Test Concentrations over 5 Orders of Magnitude

Abstract: Biodegradation of organic chemicals emitted to the environment is carried out by mixed microbial communities growing on multiple natural and xenobiotic substrates at low concentrations. This study aims to (1) perform simulation type biodegradation tests at a wide range of mixture concentrations, (2) determine the concentration effect on the biodegradation kinetics of individual chemicals, and (3) link the mixture concentration and degradation to microbial community dynamics. Two hundred ninety-four parallel te… Show more

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Cited by 16 publications
(13 citation statements)
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“…It is used to measure biodegradation by spiking the test chemical (concentrations of ≤10 μg L –1 are preferred) into aerobic natural waters or water–sediment systems with low suspended sediment concentrations (≤1 g of solids L –1 ) . However, chemical spiking has been shown to influence the microbial community and chemical attenuation, which creates doubts about the environmental relevance of the biodegradation test. , As an alternative, a nonspiked test has been suggested as it provides a better representation of biodegradation in the environment. , However, this test is constrained by the requirement for background contamination of the test chemicals in the environment of interest at quantifiable concentrations.…”
Section: Introductionmentioning
confidence: 99%
“…It is used to measure biodegradation by spiking the test chemical (concentrations of ≤10 μg L –1 are preferred) into aerobic natural waters or water–sediment systems with low suspended sediment concentrations (≤1 g of solids L –1 ) . However, chemical spiking has been shown to influence the microbial community and chemical attenuation, which creates doubts about the environmental relevance of the biodegradation test. , As an alternative, a nonspiked test has been suggested as it provides a better representation of biodegradation in the environment. , However, this test is constrained by the requirement for background contamination of the test chemicals in the environment of interest at quantifiable concentrations.…”
Section: Introductionmentioning
confidence: 99%
“…In our biodegradation test set-up, passive dosing systems are primarily used to prepare a spike solution in pure water, which is then transferred to test systems using gas tight syringes. It is also possible to add inoculum directly to the passive dosing systems in order to produce water with higher test chemical concentrations [14] . When doing so, it is important to minimize the equilibrium time for the passive dosing, since biodegradation will then start during dosing.…”
Section: Description Of Test Methodsmentioning
confidence: 99%
“…The applicability of the method has been demonstrated for very volatile chemicals with high Henry´s constants [4] , mixtures of hydrocarbons that covered a wide chemical space in volatility and hydrophobicity [5] , and UVCBs [8] . It has also been used for determining the mixture effect, the temperature effect and the concentration effect on the biodegradation kinetics of a wide range of chemicals [9 , 13 , 14] .…”
Section: Applicability Of the Testmentioning
confidence: 99%
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