本国际标准规定了浓度范围为0.5微克/升至200微克/升的以下六种水溶性有机络合剂的测定方法: EDTA(乙二腈基四乙酸)；NTA(次氮基三乙酸)；DTPA(二亚乙基三腈基五乙酸)；MGDA（甲基甘氨酸二乙酸）；？-ADA(R-丙氨酸二乙酸)；1，3-PDTA（1，3-丙二腈基四乙酸）。 该方法适用于饮用水、地下水、地表水和废水。

This International Standard specifies a method for the determination of the following six water-soluble organic complexing agents in the concentration range from 0,5 micrograms/litre to 200 micrograms/litre:

• EDTA (ethylenedinitrilotetraacetic acid);
• NTA (nitrilotriacetic acid);
• DTPA (diethylenetrinitrilopentaacetic acid);
• MGDA (methylglycinediacetic acid);
• ？-ADA (？-alaninediacetic acid);
• 1,3-PDTA (1,3-propylenedinitrilotetraacetic acid).

The method is applicable to drinking, ground, surface and waste water.