本国际标准规定了液态石油产品中钒和镍的测定方法。它也适用于通过温和加热液化或完全溶解于规定有机溶剂混合物的半固体和固体石油产品。该方法适用于钒含量在5 mg/kg至1000 mg/kg范围内，镍含量在5 mg/kg至100 mg/kg范围内的产品，尽管钒的精度数据仅确定为100 mg/kg，镍的精度数据仅确定为60 mg/kg；通过适当稀释可确定较高的含量。浓度高于约300 mg/kg的钡干扰钒的测定，浓度高于约500 mg/kg的铁干扰镍的测定。由于谱线重叠或吸收，浓度高于约500 mg/kg的其他元素可能会影响精度和准确度。

This International Standard specifies a method for the determination of vanadium and nickel in liquid petroleum products. It may also be applied to semi-solid and solid petroleum products that are either liquefied by moderate heating or completely soluble in the specified organic solvent mixture. The method is applicable to products having vanadium contents in the range 5 mg/kg to 1 000 mg/kg, and nickel contents in the range 5 mg/kg to 100 mg/kg, although precision data have only been determined up to 100 mg/kg for vanadium and 60 mg/kg for nickel; higher contents may be determined by appropriate dilution. Barium at concentrations above approximately 300 mg/kg interferes with the determination of vanadium, and iron at concentrations above approximately 500 mg/kg interferes with the determination of nickel. Other elements at concentrations above approximately 500 mg/kg may affect precision and accuracy due to spectral line overlap or absorption.