便携式分光光度法快速测定水中铬方法研究

Comparative Research on Rapid Detection of Chromium in Water Samples Using Portable Spectrophotometers

对3种便携式分光光度计快速测定水中铬的方法进行了优化和比对研究。结果表明：JH916检测仪快速测定水中铬的方法检出限（0.006 mg/L）低于ZZW-Ⅱ测试仪和PORS-15V光谱仪的方法检出限（分别为0.07 mg/L和0.03mg/L），在突发性环境污染事故应急监测中，JH916检测仪具有相对较高的灵敏度。ZZW-Ⅱ测试仪和JH916检测仪快速测定水中铬的方法精密度相近，其测定结果相对标准偏差（RSD）均未超过6.4％（n＝6），PORS-15V光谱仪快速测定水中铬的方法精密度稍差，其相对标准偏差（RSD）最大值为13％。测定实际样品时，加标回收率分别为77.5％～110％（ZZW-Ⅱ测试仪）、78.0％～108％（PORS-15V光谱仪）、80.0％～95.0％（JH916检测仪）。3种便携式分光光度计与实验室分析方法相比，测定结果相对偏差较大，相对偏差最大值分别为-27％（ZZW-Ⅱ测试仪）、-11％（PORS-15 V光谱仪）、-15％（JH916检测仪）。

Methods of rapid detection of chromium in water samples using three kinds of portable spectrophotometer were optimized.These methods were compared with each other.By testing the performance indexes of these methods and detecting the chromium in water samples,the advantages of these portable spectrophotometers were compared.The results would provide a reference for choosing the most suitable monitoring instruments in an emergent environmental pollution accident.The experimental results showed that the detection limit of JH916 portable spectrophotometer （0.006mg/L）was lower than that of ZZW-Ⅱportable spectrophotometer （0.07mg/L）and PORS-15V portable spectrophotometer （0.03mg/L）.It meant that JH916 portable spectrophotometer had higher sensitivity than the other two.The precision of JH916 type and ZZW-Ⅱtype was similar and the relative standard deviation （RSD）were all below 6.4% （n=6）.The method precision ofPORS -15V type was not as good as the other two spectrophotometers.The maximal RSD was 13%.The recoveries were 77.5% -1 10% （ZZW-Ⅱportable spectrophotometer）,78.0% -108% （PORS -15V portable spectrophotometer）,80.0% -95.0%（JH916 portable spectrophotometer）for thewater samples.There was significant difference between the accuracy of standard method and the accuracy of the three kinds of portable spectrophotometer.The maximal relative deviations were-27% （ZZW -Ⅱportable spectrophotometer）, -11% （PORS -15V portable spectrophotometer）, and-15% （JH916 portable spectrophotometer）respectively.