显微拉曼光谱法和显微红外光谱法检测饮用水中微塑料的初步比较研究

樊许娜; 陈永艳; 邢方潇; 叶必雄

doi:10.13421/j.cnki.hjwsxzz.2023.01.008

显微拉曼光谱法和显微红外光谱法检测饮用水中微塑料的初步比较研究

Preliminary comparison of microplastic determination in drinking water by micro-Raman spectroscopy and micro-infrared spectroscopy

摘要

摘要:
目的比较分析显微拉曼光谱法和显微红外光谱法检测饮用水中微塑料的粒径适用范围。
方法配制含有10~50 μm粒径微塑料标准品的模拟样品, 经前处理后, 分别采用显微拉曼光谱法和显微红外光谱法进行测定, 以回收率评价检测方法的准确度, 从而对两个方法的粒径适用范围进行研究。
结果显微拉曼光谱法测定中, 若取样方法(三点取样法和四分之一取样法)不同, 检测结果不同。对于10~50 μm粒径的微塑料, 三点取样法和四分之一取样法平均回收率的范围分别为71.61%~106.2%和41.92%~81.06%。显微红外光谱法对整个过滤区域进行检测, 回收率随粒径的增大而提高, 对于＞40 μm的微塑料, 平均回收率为91.38%。
结论综合考虑检测时长及检测效率, 当目标颗粒粒径范围较大时, 可采用三点取样—显微拉曼光谱法检测粒径＜40 μm的颗粒, 采用显微红外光谱法检测粒径＞40 μm的颗粒。

Abstract:
Objective To compare the applicable range of micro-Raman spectroscopy and micro-infrared spectroscopy for the determination of microplastics in drinking water.
Methods The simulated samples containing microplastics standards with particle sizes of 10-50 μm were prepared, and were determined after pretreatment by micro-Raman spectroscopy and micro-infrared spectroscopy, respectively. The recovery rate was used to evaluate the accuracy of the test method and investigate the applicable range of both methods.
Results The test result for microplastics with particle sizes of 10-50 μm varied with sampling method (three-point sampling method or quarter sampling method) determined by micro-Raman spectroscopy, and the average recoveries of the three-point sampling method and the quarter sampling method were 71.61%-106.2% and 41.92%-81.06%, respectively. Meanwhile, the recovery rate increased with the increasing particle size determined by micro-infrared spectroscopy, and microplastics with particle sizes of >40 μm had an average recovery rate of 91.38%.
Conclusion Considering the detection time and detection efficiency comprehensively, when the target particle size ranged largely, micro-Raman spectroscopy with the three-point sampling method can be used to detect microplastics sized less than 40 μm, and micro-infrared spectroscopy can be used to detect microplastics sized more than 40 μm.

HTML全文

参考文献(20)

施引文献

资源附件(0)