1.目的和范围1。1本试验方法测量过氧化氢漂白溶液中的螯合剂含量。1.2该方法旨在允许对工厂制备范围内的过氧化氢饱和器部分或其他制备的过氧化氢漂白溶液进行常规或定期滴定，以确定存在的螯合剂浓度。1.3该方法仅限于基于亚乙基二胺四乙酸（EDTA）、N-羟乙基二胺三乙酸（HEDTA）和二乙烯三胺五乙酸（DTPA）的螯合剂。这包括任何可能含有多种成分的专利产品（本文称为“产品”），其中一种或多种可能是螯合剂。2.原则2。1.通过两个步骤测定过氧化氢漂白浴中螯合剂或产品的百分比: 首先，在存在指示剂（PAN，1-（2-吡啶偶氮）-2-萘酚）的情况下，使用已知浓度的硫酸铜直接滴定螯合剂或产物，然后，使用更稀浓度的硫酸铜作为滴定剂，对含有螯合剂的漂白溶液进行类似的滴定。

1. Purpose and Scope1.1 This test method measures the chelating agent content in a hydrogen peroxide bleach solution.1.2 The method is designed to permit routine or periodic titration of the peroxide saturator section of a plant preparation range, or other prepared peroxide bleach solutions, to determine the concentration of chelating agent present.1.3 The method is restricted to chelating agents based on ethylenedianietetraacetic acid (EDTA), N-hydroxyethylenediamenetriacetic acid (HEDTA), and diethylenetriaminepentaacetic acid (DTPA). This includes any proprietary products ( referred to herein as "product") containing possible multiple ingredients, one or more of which may be chelating agents.2. Principle2.1 The percent chelating agent or product in the hydrogen peroxide bleach bath is determined in two steps: first, a direct titration of the chelating agent or product using a known concentration of copper sulfate in the presence of an indicator (PAN, 1-(2-pyridylazo)-2-naphthol), and second, a similar titration of the bleach solution containing the chelating agent using a more dilute concentration of copper sulfate as the titrant.