【摘要】 在Ｈ_３ＰＯ_４介质中，有吐温-２０和Ｍｎ（Ⅱ）存在下，４-氯苯基二安替比林甲烷（ＤＡｐＣＭ）与Ｖ（Ｖ）生成橙黄色产物，其λｍａｘ为４８５ｎｍ，ε＝５.０５×１０^５Ｌ·ｍｏｌ^－１·ｃｍ^－１。钒量在０．５～３.５μｇ／２５ｍＬ符合比尔定律。该法具有较高的灵敏度和较好的选择性，用于低合金钢样中微量钒的测定，结果满意。更多还原

【Abstract】 In the presence of Tween-20 and manganese（Ⅱ）, 4-chiorophenyl diantipyryl methane （DApCM） reacts with V（Ⅴ）to form an orange-yellow product in the medium of phosphoric acid. The maximum absorbance of the product is at 485 nm with molar absorptivity 5.05×10⁵L·mol^-1·cm^-1. Beer’s law is obeyed over the range of 0.5- 3.5μgV（Ⅴ）/25mL. The method is highly sensitive and good selective. Some low-alloy steel have been analyzed by this method with satisfactory results.更多还原