电感耦合等离子体发射光谱法测定植物油中的磷

用电感耦合等离子体发射光谱法(ICP-AES)测定了植物油中的磷.采用多谱线拟合技术(MSF)校正了铜对P213.617 nm和P214.914 nm光谱干扰.比较了活性炭炭化灰化法和微波消解法两种样品前处理方法对分析结果的影响.结果表明这两种前处理方法所得结果都能与国标磷钼蓝分光光度法的分析结果吻合,其中活性炭炭化灰化法的方法检出限(0.053 mg/kg)较微波消解法的方法检出限(0.42 mg/kg)更低,所以对低含量的磷的检测结果其相对误差及精密度更好.该法应用于植物油中磷的测定.

Determination of phosphorus in vegetable oils by ICP-AES

A simple and accurate method for the determination of phosphorus in vegetable oils by ICP-AES has been developed.The spectrum interferences of P213.617 nm and P214.914 nm caused by copper were corrected by multi-component spectral fitting (MSF).The sample preparation methods were studied.The analytical results of microwave digestion and active carbon ash digestion are all in accordance with those of Chinese national standard phosphomolybdate blue spectrophotomety.The MDL of active carbon ash digestion was 0.053 mg/kg,which was lower than that of microwave digestion(0.42 mg/kg).So for the detection of low concentration phosphorus,the accuracy and precision of active carbon ash digestion were better than those of microwave digestion.The proposed method has been applied to the determination of phosphorus in rap oil,tea oil,peanut oil,soybean oil,edible blended oil,peanut blended oil and corn embryo oil samples with satisfactory results.