AATCC 209-2019用于测定湿加工纺织品的pH值和总碱含量。pH值和总碱可用于确定某些湿处理步骤（尤其是漂白）后的洗涤和/或中和效率，并可用于衡量制备的织物是否适合后续染色和整理操作。为了进行定量测定，必须从纺织品样本中去除影响pH值的化学物质，作为水提取物收集，然后用pH计准确测量。

AATCC 209-2019 is used to determine the pH and total alkali content of wet processed textiles. pH and total alkali can be used to determine washing and/or neutralizing efficiency after certain wet processing steps, particularly bleaching, and can be used as a measure of the suitability of prepared fabric for subsequent dyeing and finishing operations.To make a quantitative determination, the chemicals which influence pH must be removed from the textile specimen, collected as a water extract and then accurately measured by a pH meter.