2.南京信息工程大学雷丁学院,南京 210044
1.School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
2.Reading Academy, Nanjing University of Information Science & Technology, Nanjing 210044, China
)中重金属铬(Cr)的测量系统。该系统工作流程为:用颗粒物采样器进行样品采集,通过酸化等前处理过程制成样品溶液,加入二苯碳酰二肼(DPC)进行络合反应;在长光程流通池(LWCC)中,用分光光度法对生成的有色铬络合物(Cr-苯肼羟基偶氮苯)进行吸光度测定;比对测定结果与标准样品标定结果,得出样品中铬的实际浓度。实验室测试结果和外场采样观测的结果均表明,系统具有较好的采样性能和测量精度。多次校准系统获得的线性响应
。由相同样品通过该系统和电感耦合等离子体质谱(ICP-MS)分别测定得到的数据具有良好的一致性。用该系统对南京信息工程大学大气观测站采集的大气颗粒物中总Cr浓度进行测定,得到其在测定期间的变化趋势与PM
中铬元素的分析监测技术。
A new system is developed and evaluated for the measurement of chromium (Cr) content in ambient fine particulate matter (PM
). In this measurement system, an ambient sample is collected by quartz filters, extracted by acidified solutions, and reacted with 1, 5-diphenylcarbazide (DPC) to form a chelate, which is measured by spectrophotometry using a long-optical liquid waveguide capillary (LWCC) cell and comparing with a standard Cr sample solution. Both laboratory and field experiments demonstrated that this new technique was easy to deploy and had high accuracy. Duplicated calibrations were performed which showed consistant results with
> 0.99. The system detection limit (LOD) is 0.13 ng·m
, which is determined by three times the standard deviation of Cr levels of a blank sample. Our new method showed good agreement with the-well-established inductively coupled plasma mass spectrometry (ICP-MS). The total chromium concentration was measured by the new system at the atmospheric observation station of Nanjing University of Information Science and Technology (NUIST), the trend of which agrees with that of PM
. Results demonstrate that the new system is an accurate, stable, convenient and promising technique for the measurement and analysis of ambient particulate chromium contents.
.
Schematic diagram of the developed Cr detection system
Map of the environment surrounding sampling site
Results of measurements of standard solutions for the determination of optimal conditions
使用标准溶液根据浓度梯度测得的平均标定结果
Calibrations of Cr using standard solution within the working range
UV-vis测量结果与ICP-MS测量结果之间的相关性
Correlation between UV-vis measurement and ICP-MS measurements
2018年3月26日到4月6日期间采样点Cr的时间序列
Continuous daily metal measurement of Cr from March 26, 2018 to April 6, 2018
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