ICP-OES测定羊肉汤中二氧化钛的含量

Determination of Titanium Dioxide in Mutton Soup by ICP-OES

建立一种简单、快速、准确测定羊肉汤中二氧化钛含量的分析方法。样品前处理先通过硝酸-高氯酸混合酸湿法消解,冷却后再加入硫酸和硫酸铵继续消解,用电感耦合等离子体发射光谱法测定消解液中钛含量,从而计算得出二氧化钛含量。钛在0～5.0 mg/L线性关系良好,相关系数为0.999 9,方法检出限为0.04 mg/kg;对样品进行5.0, 10.0和100.0 mg/kg 3个不同浓度加标试验,回收率为95.5%～103.0%,相对标准偏差为1.68%～4.70%(n=6)。该方法简便、快捷,有较高的灵敏度、准确度、精密度和较低的检出限,适用于羊肉汤中二氧化钛的测定。

A simple, rapid and accurate method for determining the contents of titanium dioxide in mutton soup was established, determined by ICP-OES. The pretreatment of the sample was followed by digestion with nitric acid-perchloric acid mixed acid and then quenched by the addition of sulfuric acid and ammonium sulfate to continue to heating digestion. The titanium content of titanium dioxide was determined by ICP-OES, and the content of titanium dioxide in sample was calculated according to the mass fraction. The linearity of titanium was good in the range of 0-5.0 mg/L, with correlation coefficient of 0.999 9 and the detection limit was 0.04 mg/kg. The recoveries of the method in 5.0, 10.0 and 100.0 mg/kg were within 95.5%-103.0% and the relative standard deviations were within 1.68%-4.70%(n=6). The method was convenient, rapid with good sensitivity, accuracy precision, and detection limit. It was suitable for the determination of titanium dioxide in mutton soup.