长江科学院院报2012，Vol.29Issue(9)：22-26,5.DOI:10.3969/j.issn.1001-5485.2012.09.006
pH值对二苯碳酰二肼分光光度法测定六价铬的影响
Influence of pH Value on the Determination of Hexavalent Chromium by Diphenylcarbazide Spectrophotometry
摘要
Abstract
Based on the 1,5 -diphenylcarbazide spectrophotometry, we researched on the influence of pH value on the determination of hexavalent chromium. By adding different amounts of acid into two water samples with different volumes and concentrations, we measured the absorbances of the solutions so as to determine the hexavalent chromium. Through analysis by EXCEL on the measured data, we found that the absorbance reduced with the decrease of pH value. In the presence of high acidity, which means small pH value, the measured hexavalent chromium was smaller than the original value before adding acid. Therefore, the variation of pH value had an impact on the measurement of hexavalent chromium. Moreover, we employed the gray system model GM( 1,1) to process the experimental data, and derived a linear equation for the absorbance under different acidities. Through t test and F test, no significant difference was found between calculated absorbance and measured absorbance. This research is helpful to quantitatively looking into the influence of pH value on hexavalent chromium determination.关键词
pH值/C13H14N4O光度法/测定Cr(Ⅵ)Key words
pH value/ diphenylcarbazide (C14H14N4O) spectrophotometry/ determination of hexavalent chromium (Cr(Ⅳ))分类
资源环境引用本文复制引用
王海云,李敏锐,廖涛,谭飞帆,邓杰..pH值对二苯碳酰二肼分光光度法测定六价铬的影响[J].长江科学院院报,2012,29(9):22-26,5.基金项目
三峡大学人才基金(KJ2009B005) （KJ2009B005）
