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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。
In the presence of Tween-20 and Mn (Ⅱ), 4-chlorophenyldiantipyrylmethane (DApCM) and V (V) generated orange-yellow products in H_3PO_4 medium with λmax of 485 nm and ε = 5 .05 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1). Beer’s law is obeyed when the amount of vanadium is 0.5 ~ 3.5μg / 25mL. The method has high sensitivity and good selectivity for the determination of trace vanadium in low alloy steel samples with satisfactory results.