Flow dissolution of 1,5-diphenylcarbazide for the determination of chromium(VI)
Flow dissolution of 1,5-diphenylcarbazide for the determination of chromium(VI)
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DOI：
10.1039/an9962100613
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发表时间：
1996
期刊：
影响因子：
4.2
通讯作者：
F. Andrade;M. Tudino;O. Troccoli
中科院分区：
文献类型：
--
作者：
F. Andrade;M. Tudino;O. Troccoli
提出了一种用1,5-二苯脲（DPC）流动注射分光光度法测定CrVI的替代方法，该方法涉及试剂的在线溶出。固体DPC （25% m/m的二氧化硅）填充在PTFE柱中，然后将其纳入单线流动系统中，以便样品通过柱时影响试剂溶解。这个过程减少了化学对色散值的贡献到最小，并且由于没有折射率峰，给出了一个低检测极限。与以前报告的数字相比，业绩数字有所改善。校正曲线在0.800 mg - 1 CrVI范围内呈线性，斜率为0.49 l mg - 1；检出限为0.005 mg l-1。相对标准偏差优于1%。
An alternative procedure for the flow injection spectrophotometric determination of CrVI with 1,5-diphenylcarbazide (DPC), involving on-line dissolution of the reagent, is presented. Solid DPC (25% m/m in silica) is packed in a PTFE column, which is then incorporated in a single-line flow system so that reagent dissolution is effected as the sample passes through the column. This procedure reduces the chemical contribution to the dispersion value to a minimum and gives a low detection limit owing to the absence of refractive index peaks. An improvement of the figures of merit compared with those reported previously is shown. The calibration graph is linear up to 0.800 mg l–1 CrVI, with a slope of 0.49 l mg–1; the detection limit is 0.005 mg l–1. The relative standard deviation is better than 1%.