Basic concepts</p
pH值是指氢离子浓度指数，是溶液中氢离子的总数和总物质的量的比，表示溶液酸性或碱性程度的数值，即所含氢离子浓度的常用对数的负值。
纺织品pH值则是指纺织品水萃取液pH值的测定。自强制性标准GB18401《国家纺织产品基本安全技术规范》颁布实施以来，纺织品pH值作为重要的纺织品安全性能指标一直是各监管机构重点检测的质量指标，同时也是不合格频繁出现的指标之一。
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The hazards of textile pH exceeding the standard</p
The pH value of normal human skin is between 5.5-6.5, and the chemical reaction is weakly acidic. The sweat and oil secreted by the sweat glands of the skin and sebum itself have a pH value. If the pH value of the outside world is too different from the pH value that the human body normally needs, it will cause people to suffer from diarrhea. Feeling unwell and experiencing many skin diseases �</p
纺织品的pH值测试正是基于这一需求而产生的� �pH值与标准值之间发生偏离，造成服装的酸碱不当，将导致皮肤表层的天然屏障遭到破坏，人体本身中性偏酸性的皮肤受到刺激，产生灼伤感，滋生细菌，引起疾病� Therefore, the country has formulated standards such as GB18401, which stipulates that the pH value of Class A infant textile products should be in the range of 4.0 to 7.5, the pH value of Class B textiles that directly contact the skin should be between 4.0 and 8.5, and the pH value of Class C non-direct contact with the skin should be between 4.0 and 8.5. The pH value of textiles should be in the range of 4.0 to 9.0, when the human body is comfortable to wear �</p
Reasons for unqualified pH value of textiles</p
There are many reasons why the pH value of textiles exceeds the standard. If the various dyes and finishing auxiliaries used in the printing, dyeing and finishing processes of textiles are not fully washed or neutralized, and various finishing agents are added during the washing process without standardized control, It will cause the pH value of the final product to exceed the standard. �总结下来，有如下几种原因：</p
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1、企业为降低成本,随意减少生产工序，对经过染色、整理或特殊工艺处理后的产品没有进行充分水洗或酸碱中和，致使pH值偏高或偏低。
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2、生产企业使用一些价格低廉、质量不稳定的直接染料、涂料进行染色和印花。使用这些染料生产的产品在进行弱酸、弱碱中和后，产品发暗，没有光泽，甚至色相发生变化或留有难闻的气味。因此为保持产品的鲜艳光泽，有些企业明知道产品pH值偏高，也不进行中和，造成了产品质量不合格。
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3、一些小企业缺乏印染方面的技术人才，重要岗位的工作人员没有受过系统的专业培训，有的甚至还靠经验来决定水洗次数和所加酸、碱量的多少。生产的纺织品的pH值不稳定，pH值不合格现象突出。
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4、部分企业实验室缺少必要的检测设备，只简单使用pH试纸进行检测。而研究表明，pH试纸只适用于检测具有较大电解质浓度溶液的酸碱度，纺织品萃取液pH值一般接近中性，溶液电解质浓度很低，不适宜用pH试纸测量。
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5、企业试验人员操作误差的影响。纺织品pH值的测试是一项对仪器、试验条件要求特别高的试验操作，试验温度、取样质量、萃取时间、pH计的校准等均会影响纺织品pH值的测定结果。
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Relevant standards for pH value testing of textiles</p
纺织品pH值测试作为国家强制性标准GB18401《国家纺织产品基本安全技术规范》中的一个重要考核指标，越来越受到国内外消费者的重视。Oeko-Tex标准100对pH值限定与我国制定的标准GB18401-2010略有差异，如下表1所示：
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Common standards for pH value testing of textiles are as follows:</p
ISO3071:2005 “Determination of pH value of aqueous extracts of textiles”; </p
ISO4045:2008 “Determination of pH value of leather”; </p
GB/T7573-2009 “Determination of pH value of aqueous extracts of textiles”; </p
AATCC81:2012 “PH Value of Aqueous Extracts of Wet-Processed Textiles”; </p
EN1413 “Determination of pH value of aqueous extracts of textiles”; </p
JISL1096《纤维制品水萃取液pH测定》。
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Suggestions</p
纺织品pH值超标，消费者很难通过外观来辨别，只有通过专业检测才能检测出� Experts suggest, “After buying new clothes, especially children’s and infant clothes, do not wear them directly. Rinse them with clean water before wearing them. This can reduce harmful substances in the clothes and keep the pH value from deviating from the standard range as much as possible. ”</p
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Source: China Textile Joint Inspection Quanzhou
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