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目前我国应用最广泛的阴离子合成洗涤剂以十二烷基苯磺酸钠(简称烷基苯磺酸钠)为主,其次有少量的十二烷基硫酸钠和十二烷基磺酸钠。水中阴离子合成洗涤剂常用亚甲蓝法测定,该法测定亚甲蓝活性物质总量,干扰物质多、灵敏度不高。本工作拟定水中阴离子合成洗涤剂在氯化钠共存下用甲基异丁基酮萃取,原子吸收法测定钠含量间接得出阴离子合成洗涤剂含量。分析过程简单、快速、准确度高。
At present, the most widely used anion synthetic detergent in our country is sodium dodecyl benzene sulfonate (abbreviated as sodium alkyl benzene sulfonate), followed by a small amount of sodium lauryl sulfate and sodium dodecyl sulfate. Anionic anionic synthetic detergent commonly used methylene blue assay, the method for the determination of methylene blue total active substances, interfering substances, the sensitivity is not high. In this work, the anionic anionic synthetic detergent in water was extracted with methyl isobutyl ketone under the coexistence of sodium chloride, and the content of anionic synthetic detergent was determined indirectly by the sodium absorption determined by atomic absorption spectrometry. The analysis process is simple, fast and accurate.