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首页> 外文期刊>The Science of the Total Environment >Development and application of screening tools for biodegradation in water-sediment systems and soil
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Development and application of screening tools for biodegradation in water-sediment systems and soil

机译：水沙系统和土壤中生物降解筛选工具的开发与应用

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Two new screening-test systems for biodegradation in water-sediment systems (WSST; Water-Sediment Screening Tool) and soil (SST; Soil Screening Tool) were developed in analogy with the water-only test system OECD 301C (MITI-test). The test systems could be applied successfully to determine reproducible experimental mineralization rates and kinetics on the screening-test level for fifteen organic chemicals in water (MITI), water-sediment (WSST) and soil (SST). Substance-specific differences were observed for mineralization compared among the three test systems. Based on mineralization rate and mineralization half-life, the fifteen compounds could be grouped into four biodegradation categories: substances with high mineralization and a half-life ＜28 days in (1) all three test systems, (2) only in the Mm test and in the WSST, (3) only in the SST, and (4) none of the test systems. The observed differences between the MITI results and the WSST and SST biodegradation rates of the compounds do not reflect their (reversible) sorption into organic matter in terms of experimental K_(oc) values and log D values for the relevant pH range. Regarding mineralization kinetics we recommend to determine the lag-phase, mineralization half-life and mineralization rate using a 5-parameter logistic regression for degradation curves with and without lag-phase. Experimental data obtained with the WSST and the SST could be verified by showing good agreement with biodegradation data from databases and literature for the majority of compounds tested. Thus, these new screening-tools for water-sediment and soil are considered suitable to determine sound and reliable quantitative mineralization data including mineralization kinetics in addition to the water-only ready biodegradability tests according to OECD 301.
机译：与纯水测试系统OECD 301C（MITI-test）类似，开发了两个新的水-沉积物系统（WSST；水-沉积物筛选工具）和土壤（SST；土壤筛选工具）中生物降解的筛选测试系统。该测试系统可以成功地用于在水中（MITI），水沉积物（WSST）和土壤（SST）中的15种有机化学物质的筛选测试水平上确定可重现的实验矿化速率和动力学。在三个测试系统之间观察到矿化的物质特异性差异。根据矿化速率和矿化半衰期，可以将这十五种化合物分为四个生物降解类别：（1）所有三个测试系统中，矿化度高且半衰期＜28天的物质；（2）仅在Mm测试中在WSST中，（3）仅在SST中，（4）没有测试系统。 MITI结果与化合物的WSST和SST生物降解速率之间观察到的差异并未反映出它们在相关pH范围内的实验K_（oc）值和log D值（可逆）吸附到有机物中。关于矿化动力学，我们建议使用5参数logistic回归来确定有无矿相的降解曲线的滞后相，矿化半衰期和矿化速率。用WSST和SST获得的实验数据可以通过与大多数测试化合物的数据库和文献中的生物降解数据显示出良好的一致性来验证。因此，这些新的水沉积物和土壤筛选工具被认为适合于确定合理而可靠的定量矿化数据，包括矿化动力学，以及根据OECD 301进行的仅需水的可生物降解性测试。

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