【摘要】 在研究二苯碳酰二肼测定铬的反应机理的同时,对使用同一消化浪测定土样中铬和钛的可行洼进行了试验,结果认为,采用H₂SO₄—H₃PO₄—HNP₃体系消化土壤样品,消化液可分别用二苯碳酰二肼比色法测铬和用二安替比林甲烷比色法测钛。经对全国不同地区的五个土样用本法与常规测铬法的对照试验,得到一致的结果。作者还发现,使用不同纯度级的二苯碳酰二肼得到不同的结果,认为必须使用分析纯级以上的试剂。 根据对络台物的可见一紫外吸收光谱的研究和其他试验结果,并结合前入的电泳试验等结果,阐述了二苯碳酰二肼测定铬的反应机理。更多还原

【Abstract】 In this paper,the raachenisra of the reaction between diphenylcarbazide and chromium was studied.According to the UV and visible spectrum and other experimental results,the possible machenism was presented.At the same time,the method of determining Cr and Ti by using the same digestion solution of the soil sample,which was treated in H2SO4-H3PO4-HNO3 system,was proposed.It was also pointed out that the purity of the diphenylcarbazide was important in colormetric determination of chromium.更多还原