收藏我们   ENGLISH  
论文查询
范围:  
提 交
《化学分析计量》 2021年第03期
DOI:10.3969/j.issn.1008-6145.2021.03.016
水分活度仪的校准
何欣1,唐敏然2,戴红1,王伟东1
1.广州计量检测技术研究院,广州 510030; 2.中山大学,广州 510275 
Calibration of water activity meter
He Xin1, Tang Minran2, Dai Hong1, Wang Weidong1
1. Guangzhou Institute of Measurement and Testing Technology, Guangzhou 510030, China; 2. Sun Yat-sen University, Guangzhou 510275, China 
摘要:根据水分活度仪的工作原理和计量特性,利用溴化锂、氯化锂、乙酸钾、氯化镁、碳酸钾、溴化钠、碘化钾、氯化钠、氯化钾、硫酸钾饱和溶液作为标准物质,研究制订一种简单、准确、可靠的水分活度仪校准方法。对于不具备温度控制功能的水分活度仪,环境温度每变化10 ℃,乙酸钾、溴化锂、溴化钠饱和溶液的水分活度值变化分别可达6.67%、6.25%、5.38%。故环境温度控制对校准结果有重要影响。而环境相对湿度在20%~90%、大气压在80~106 kPa 对冷镜露点法或电容法水分活度仪的校准结果几乎没有影响。该方法利用可溯源至国家湿度标准的精密露点仪测量值代替饱和盐溶液文献值,测量不确定度为0.002~ 0.006(k=2),解决了饱和盐溶液文献值无法溯源或不确定度较大等问题。 
Abstract:Based on the working principle and measurement characteristics of water activity meter, a simple, accurate and reliable calibration method of water activity meter was proposed by using saturated salt solutions such as LiBr, LiCl, KAC, MgCl2, K2CO3, NaBr, KI, NaCl, KCl and K2SO4 as reference materials. As for water activity meters without temperature control, when ambient temperature changed by 10 ℃, the water activation of KAC solution changed by 6.67%, which of LiBr solution changed by 6.25%, and which of NaBr solution changed 5.38%, so the environmental temperature control had an important influence on the calibration results. However, when the relative humidity was 20%-90% and the atmospheric pressure was 86-106 kPa, the calibration results of water activity meter by cold mirror dew point method or capacitance method were scarcely influenced. By this method, the reference value of saturated salt solution was replaced by the measured value of precision dew point meter which could be traced to national humidity standard. After that, the uncertainty of measurement is 0.002-0.006(k=2), and the problem of the literature value of saturated salt solution not be traced or with large uncertainty is solved. 
关键词:水分活度仪;冷镜露点法;电容法;校准 
Keywords:water activity meter; chilled mirror dew point method; capacitance method; calibration 
基金:广东省质量技术监督局科技计划项目(2017CJ02) 
本文引用格式:
何欣,唐敏然,戴红,等. 水分活度仪的校准[J]. 化学分析计量,2021,30(3):72. 

全文:
相似文章:
  基于光学法的化学需氧量实时测定仪校准方法
2021年第02期
  总磷测定仪校准方法
2021年第01期
  比色法总磷自动监测仪的校准
2020年第06期
  水泥中铬测定仪的校准方法
2020年第04期
  便携式拉曼光谱仪的校准方法
2020年第04期
  水中臭氧分析仪校准用臭氧水溶液配制用酸的选择
2020年第05期
  基于液相色谱原理的黄曲霉毒素测定仪校准方法
2020年第03期
  石油产品微量残炭测定仪的校准
2020年第02期
  在线式红外分光测油仪的校准
2020年第01期
  石油产品酸值测定仪校准方法
2019年第06期
《化学分析计量》杂志社 版权所有,未经授权禁止复制或者建立镜像
地址:山东省济南市天桥区田庄东路3号 邮编:250031
电话:0531-85878132 85878148 85878224 85878278 传真:0531-85947355
鲁ICP备05018524号-6