海水电导率仪校准及标准值计算方法  

Calibration of seawater conductivity instrument and calculation method of reference value

作　　者：高占科[1] 袁玲玲[1] 胡波[1] Gao Zhanke;Yuan Lingling;Hu Bo(National Center of Ocean Standards and Metrology,Tianjin 300112,China)

机构地区：[1]国家海洋标准计量中心,天津300112

出　　处：《化学分析计量》2021年第11期73-77,共5页Chemical Analysis And Meterage

摘　　要：海水电导率是海洋调查、观测和监测活动中最常用参数之一,海水电导率与温度、压力和盐度的关系十分密切。针对常规海水电导率仪,其计量校准是以天然海水为介质,通过降温方式改变恒温槽内海水温度,实现实验室条件下提供不同电导率的海水,模拟海水电导率仪在海上现场的使用环境,确保计量校准接近海上现场使用实际过程。基于电导测盐法原理和国际海水实用盐度的定义,详细分析海水电导率、电导率比以及海水实用盐度等参量之间的换算关系。在实验室精确测定恒温海水槽温度和实用盐度的基础上,根据海水样品实用盐度不随温度变化的特性,详细阐述海水电导率仪校准及标准值的计算流程,并分析了该方法获取电导率标准值的不确定度。The conductivity of seawater was one of the most common parameters in marine survey,observation and monitoring activities.The conductivity of seawater was closely related to temperature,pressure and salinity.In view of the conventional seawater conductivity instrument,the calibration used natural seawater as the medium.By changing the seawater temperature in the constant temperature bath through cooling method,the seawater with different conductivity can be provided under laboratory conditions to simulate the use environment of seawater conductivity instrument in the marine,so as to ensure that the measurement calibration was close to the actual application process.Based on the principle of conductance salt measurement and the definition of international practical salinity of seawater,the conversion relationship between seawater conductivity,conductivity ratio and seawater practical salinity was analyzed in detail.According to the characteristic that the practical salinity of seawater samples does not change with temperature,based on the accurate measurement of the temperature and salinity of constant temperature seawater bath in the laboratory,the calculation process of calibration reference value of seawater conductivity instrument was described in detail,and the uncertainty of the reference value was analyzed.

关 键 词：海水电导率仪 计量校准 海水实用盐度 标准值 

分 类 号：O661[理学—分析化学]