便携式分光光度法快速测定水中铁方法研究

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

对3种便携式分光光度计快速测定水中铁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：ZZW-Ⅱ测试仪快速测定水中铁的方法检出限（0.2 mg/L）高于JH916检测仪和PORS-15V光谱仪的方法检出限（分别为0.01 mg/L和0.04 mg/L）,在突发性环境污染事故应急监测中,JH916检测仪和PORS-15V光谱仪具有相对较高的灵敏度.ZZW-Ⅱ测试仪和PORS-15V光谱仪快速测定水中铁的方法精密度相近,其测试结果相对标准偏差（RSD）均未超过6.5%（n=6）,JH916检测仪快速测定水中铁的方法精密度稍差,其相对标准偏差（RSD）最大值为10.9%.测试实际样品时,加标回收率分别为80.5%~98.0%（ZZW-Ⅱ测试仪）、82.5%~118%（PORS-15V光谱仪）、86.5%~104%（JH916检测仪）,表明3种便携式分光光度计均有较好的准确度.3种便携式分光光度计与实验室分析方法相比,测试结果相对偏差较大,相对偏差最大值分别为-18.8%（ZZW-Ⅱ测试仪）、-19.7%（PORS-15V光谱仪）、-25.9%（JH916检测仪）.

Methods of rapid determination of ferrum in water samples by using three kinds of portable spectrophoto？meter 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 determinating the ferrum 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 ZZW-Ⅱportable spectrophotometer（0.2 mg/L）was higher than that of JH916 portable spectrophotometer（0.01 mg/L）and PORS-15V portable spectrophotometer（0.04 mg/L）, it meant that the PORS-15V portable spectrophotometer and JH916 portable spectrophotometer had higher sensitivity of monitoring in sudden environmental pollution accident than ZZW-Ⅱ portable spectrophotometer. The method precision of PORS-15V portable spectrophotometer and ZZW-Ⅱportable spectrophotometer was similar and the RSDs（relative standard deviation）were all below 6.5%（n=6）. The method precision of JH916 portable spectrophotometer was not better as the other two spectrophotometers,the maximal RSD was 10.9%. The recoveries were 80.5%-98.0%（ZZW-Ⅱportable spectrophotometer）,82.5%-118%（PORS-15V portable spectrophotometer）,86.5%-104%（JH916 portable spectrophotometer）for the actual water 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-19%（ZZW-Ⅱportable spectrophotometer）,17%（PORS-15V portable spectrophotometer）,-15%（JH916 portable spectrophotometer）.