郑州市现场质控考核食盐碘含量测定结果

Analysis of on-site quality control assessment results of iodine content determination in edible salt in Zhengzhou City

目的分析郑州市食盐碘含量测定现场质控考核结果,了解和掌握基层实验室人员的实际业务能力和水平,发现问题并制定改进措施。方法组织郑州市所辖11个县(市、区)实验室共22人进行现场理论考核,理论考核分为测定原理、适用范围、试剂配制、关键步骤、结果计算公式5个部分。以实验室为单位分组进行标准物质平行测定,对操作技能进行考核,查找、记录存在的问题。理论考核内容和现场技能考核细则判定依据《制盐工业通用试验方法碘的测定》(GB/T 13025.7-2012)。结果理论考核中,仅试剂配制和关键步骤两部分正确率为100%;测定原理、适用范围、结果计算公式部分正确率在80%以上。操作技能主要存在装载液体、样品称量、滴定操作不规范等问题。有1个实验室质控样品测定结果超出标准物质参考范围,判定为不合格。结论部分基层实验室人员的理论基础较薄弱,操作技能规范性不够,应制定切实可行措施,做好技术培训、指导和考核工作。

Objective To analysis the on-site quality control assessment results of salt iodine content in Zhengzhou City,and to understand and master the actual professional abilities and level of grass-roots laboratory analyzers,and to search the problems and make improvement measures.Methods The total of 22 analyzers from 11 affiliated grass-roots laboratories of Zhengzhou City were gathered to take part in the on-site theoretical examination.The theoretical assessment was divided into five parts:measurement principle,application range,reagent preparation,key steps,and calculation formula of results.Parallel samples of standard materials were determinated in laboratory units,to evaluated operational skills,the problems during the process were recorded simultaneously.The content of the theoretical assessment and the rules for the assessment of on-site skills were based on the "Measurement of Iodine for the General Test Method of the Salt Industry"(GB/T 13025.7-2012).Results In the theoretical assessment,the correct rates of reagent preparation and key steps were 100%,and that of measurement principle,application range,and calculation formula of results were more than 80%.The main problems of operation skills were from liquid loading,sample weighing and titration operation,etc.One laboratory result of quality control sample exceeded the reference range and was judged to be unqualified.Conclusions The theoretical basis of some laboratory analyzers are not solid,the operational skills are lack of standardization.In view of the current situation,as the higher level technical guidance unit,it is necessary and responsible for us to formulate practical measures in training,guidance and assessment to help them improve business level and abilities.