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利用钒催化氯酸钾氧化苯肼,继与H-酸偶合得紫红色的偶氮化合物可测定痕量钒(V),于527nm处测量紫红色反应产物的吸光度,当钒量在0.001～0.1μg/25ml范围时呈线性关系,方法灵敏度的表观摩尔吸光系数ε为0.8×10~7。硒等元素的干扰可藉碱沉淀分离法予以消除,用于钢铁等试样中钒的测定、结果尚满意。
Trace Vanadium (V) can be determined by following the azo compound of vanadium catalyzed potassium chlorate oxidation of phenylhydrazine and then coupled with H-acid to measure the absorbance of the purple reaction product at 527 nm. When vanadium content is 0.001-0.1 μg / 25ml range linear relationship between the sensitivity of the apparent molar absorptivity ε of 0.8 × 10 ~ 7. Selenium and other elements of the interference can be removed by alkali precipitation separation method for the determination of vanadium in steel and other samples, the results are still satisfied.