自动搅拌萃取-紫外分光光度法测定常州市城市饮用水水源地石油类

根据《水质石油类的测定紫外分光光度法(试行)》(HJ 970—2018)的要求,以正己烷为溶剂,采用自行设计的搅拌式液液萃取器处理样品,萃取相经硅酸镁吸附脱除极性物质后,用紫外分光光度法测定常州市城市饮用水水源地的石油类指标。结果表明:方法检出限为0.01 mg/L,线性范围为0~16.0 mg/L,相关系数为0.9998,4种不同浓度配制样品测定的相对误差为-15.0%~4.0%,相对标准偏差为2.2%~8.8%。各项技术指标均满足《HJ 970—2018》相关质量控制要求,相比手动萃取-红外分光光度法,自动搅拌萃取-紫外分光光度法能有效提高分析效率和降低职业危害。

Determination of Petroleum in Changzhou Drinking Water Source Areas by Self designed Automatic Stirring Extraction Ultraviolet Spectrophotometry

According to Water quality-Determination of petroleum-Ultraviolet spectrophotometric method(Trial)(HJ 970—2018),petroleum in samples of Changzhou drinking water source areas was completely extracted by n-hexane using self-designed stirring extractor.Petroleum was accurately determined by ultraviolet spectrophotometry after removing polar substances through magnesium silicate adsorbent.Experimental results showed that:detection limit was 0.01 mg/L,linear plot was obtained between 0~16.0 mg/L,with correlation coefficient of 0.9998.Samples with four different levels of petroleum standard were detected with relative errors ranged from-15.0% to 4.0% and relative standard deviations ranged from 2.2% to 8.8%.Each technical indicator satisfied the requirements of“HJ 970—2018”.Compared to manual shaking extraction-infrared spectrophotometry method,this automatic stirring extraction-ultraviolet spectrophotometry method effectively improved analysis efficiency and also decreased occupational hazard.