|
| Effect of acid catching on determination of As in grain by microwave digestion-hydride generation-atomic fluorescence |
| Received:July 24, 2018 Revised:August 06, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.3969/j.issn.2095-1035.2018.06.002 |
| KeyWord:Acid catching; Microwave digestion; Hydride formation; Atomic fluorescence method; Arsenic; Grain |
| Author | Institution |
| Duan Xu |
陕西省矿产资源勘查与综合利用重点实验室，国土资源部西安矿产资源监督检测中心 |
| Han Zhangxiong? |
陕西省矿产资源勘查与综合利用重点实验室，国土资源部西安矿产资源监督检测中心 |
| Bai Xinyue |
陕西省矿产资源勘查与综合利用重点实验室，国土资源部西安矿产资源监督检测中心 |
| Dong Yani |
陕西省矿产资源勘查与综合利用重点实验室，国土资源部西安矿产资源监督检测中心 |
| Liu Long |
陕西省矿产资源勘查与综合利用重点实验室，国土资源部西安矿产资源监督检测中心 |
|
| Hits: 1052 |
| Download times: 643 |
| Abstract: |
| The reduction effect of thiourea-ascorbic acid was affected by the content of nitric acid in the determination of arsenic in grain samples by hydride generation-atomic fluorescence spectrometry. The content of nitric acid in the test solution is too high, and the redox reaction with thiourea-ascorbic acid solution will reduce its reduction efficiency. In this study, the best acid catching condition was obtained in the determination of As in grain by the method of Hydride Formation-Atomic Fluorescence Spectrometry with digestion by microwave through testing the acid catching time and the acid catching temperature. The result showed that the concentration of As in grain is linearly related to the fluorescence intensity, which is in accordance with the equation of y = 0.0028x - 0.1728 (R2= 0.9993). The detection limit is 1.72 ng/g. The relative standard deviation RSD of the 9 samples is in the range of 4.32% to7.59 %, and the relative error(RE) is less than ± 6.50 %. The method is stable in numerous tests and can be used for the rapid determination of arsenic in grain samples. |
| Close |