便携式分光光度计快速测定水中镍

对3种便携式分光光度计快速测定水中镍的方法进行了优化和比对研究。通过研究各仪器性能指标以及测定实际水质样品,对不同便携式分光光度计的优势进行了比较,为突发性环境污染事故应急监测选择合适的监测仪器提供了技术参考。结果表明:JH916检测仪快速测定水中镍的方法检出限(0.01 mg/L)低于ZZW-II测试仪和PORS-15 V光谱仪方法检出限(均为0.2 mg/L),在突发性环境污染事故应急监测中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镍的方法精密度大体相当,测定结果相对标准偏差均未超过6.5%(n=6),PORS-15V光谱仪快速测定水中镍的方法精密度稍差,最大相对标准偏差达到13.5%。3种便携式分光光度计测定实际样品时,加标回收率分别为79%~96%(ZZW-II测试仪)、83%~113%(PORS-15V光谱仪)、90%~114%(JH916检测仪),表明3种便携式分光光度计均有较好的准确度。

Contrast Research on Rapid Determination of Nickel in Water Samples by Using Portable Spectrophotometers

Methods of rapid determination of nickel in water samples by using portable spectrophotometers were optimized and the contrast research on these methods was carried out in this paper. By testing the performance indexes of different instrumental methods and measuring the nickel in actual water samples, the advantages of different portable spectrophotometers were researched comparatively. The research result will be able to provide a reference for choosing the suitable monitoring instruments in sudden environmental pollution accident. The experimental results showed: the detection limit of JH916 portable spectrophotometer (0.01 mg/L) was lower than that of ZZW-II portable spectrophotometer and PORS-15V portable spectrophotometer (0.2 mg/L), it meant that the JH916 portable spectrophotometer had higher sensitivity of monitoring in sudden environmental pollution accident than the other two spectrophotometers. The method precision of JH916 portable spectrophotometer and ZZW-II portable spectrophotometer was similar and the RSDs (relative standard deviations) were all below 6.5% (n=6). The method precision of PORS-15V portable spectrophotometer was not better as the other two spectrophotometers, the maximal RSD was 13.5%. The recoveries were 79%-96% (ZZW-II portable spectrophotometer), 83%-113% (PORS-15V portable spectrophotometer), 90%-114% (JH916 portable spectrophotometer) for the actual water samples.