ISO 14593:1999 水质 含水介质中有机化合物极限需氧生物降解性评价 在密封容器中无机碳分析方法（CO2液面上空间试验）

标准编号：ISO 14593:1999

中文名称：水质 含水介质中有机化合物极限需氧生物降解性评价 在密封容器中无机碳分析方法（CO2液面上空间试验）

英文名称：Water quality — Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium — Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test)

发布日期：1999-03

标准范围

本国际标准规定了一种通过分析无机碳来评估水介质中给定微生物浓度下有机物质最终需氧生物降解能力的方法。本国际标准适用于以下有机化合物:a） 试验条件下的水溶性；b） 在试验条件下，水溶性差，在这种情况下，可能需要采取特殊措施来实现化合物的良好分散（见ISO 10634）；c） 挥发性；d） 在为试验选择的浓度下，对试验微生物无抑制作用。在本试验中，在试验容器中原位测量生物生成的无机碳，测量速率几乎等于微生物生成速率。注1:本国际标准中描述的条件并不总是与允许发生最大程度生物降解的最佳条件相对应。其他生物降解方法见ISO 15462。注2:对于高挥发性物质，可通过减少顶空体积将气相损失降至最低。然而，试验系统中应有足够的氧气，以防止生物降解受到氧气限制。注3:可根据8.3中的规定，或通过使用任何其他方法确定物质对细菌的抑制作用来确定抑制作用的存在（例如，参见ISO 8192）。

This International Standard specifies a method, by analysis of inorganic carbon, for the evaluation in an aqueous medium of the ultimate aerobic biodegradability of organic substances at a given concentration of microorganisms.This International Standard is applicable to organic compounds which are:a) water-soluble under the test conditions;b) poorly water-soluble under the test conditions, in which case special measures may be necessary to achieve a good dispersion of the compound (see ISO 10634);c) volatile; d) not inhibitory to the test microorganisms at the concentration chosen for the test.In this test, biogenically produced inorganic carbon is measured in situ in the test vessels in such a manner that the rate measured nearly equals the rate of microbial production.NOTE 1 The conditions described in this International Standard do not always correspond to the optimal conditions for allowing the maximum degree of biodegradation to occur. For alternative biodegradation methods see ISO 15462.NOTE 2 With highly volatile substances, losses to the gaseous phase can be minimized by reducing the volume of the headspace. However, there should be sufficient oxygen in the test system to prevent biodegradation being oxygen-limited.NOTE 3 The presence of an inhibitory effect can be determined as specified in 8.3, or by using any other method for determining the inhibitory effect of a substance on bacteria (see, for example, ISO 8192).

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