Method for measuring trace amount of zinc in salt through cloud point extraction-spectrophotometric method

The invention relates to the technical field of measuring trace amount of zinc in salt, in particular to a method for measuring the trace amount of zinc in salt through a cloud point extraction-spectrophotometric method. Zn2+ and 2,2-dipyridyl form a stable complex in an acetic acid-sodium acetate buffer system with the pH of 5.20 with a nonionic surfactant Triton X-114 as an extraction agent, cloud point induced phase separation of the surfactant is used, the cloud point extraction-spectrophotometric method is built to measure the zinc content in salt, and bases are provided for quality control of salt. The method is mainly used in measurement of the trace amount of zinc in salt. The method is safe, efficient and high in accuracy, and is a novel environment-friendly analysis method. 本发明涉及测量食盐中痕量锌的技术领域，更具体而言，涉及种浊点萃取-分光光度法测定食盐中痕量锌的方法；该方法提出了以非离子表面活性剂Triton X-114为萃取剂，Zn与2,2-联吡啶在pH=5.20的醋酸-醋酸钠缓冲体系中形成稳定络合物，利用表面活性剂的浊点引发相分离，建立了浊点萃取-分光光度法测定食盐中的锌含量，为食盐的质量控制提供依据；本发明主要应用在食盐中痕量锌的测定方面；本发明安全高效，准确度高，是种新型的绿色分析方法。