电感耦合等离子体原子发射光谱法测定新购及再生铬矿砂中二氧化硅

新及再生铬矿砂经1000℃灼烧,研磨,以过氧化钠为熔剂,经高温熔融,热水洗涤,盐酸、硝酸酸化前处理样品,直接用电感耦合等离子体发射光谱法测定铬矿砂中的二氧化硅。试验了熔融试样时引入的基体元素钠对被测元素的干扰情况,结果表明,过氧化钠加入为1.5克对检测干扰影响小。采用加基体铬、铁有效克服了基体效应对结果影响。硅的检出限为0.0049 mg/L, 二氧化硅测定范围为0.010%～6.0%。对铬矿砂标准物质进行测定,结果与标准值一致,方法精密度(RSD,n=10)小于1%。常规重量方法步骤繁琐、耗时长、工作量大的不足。本检测方法大大提高了检测效率,满足生产需要。

Determination of silica in new and renewable chrome ore by inductively coupled plasma atomic emission spectrometry

New and renewable chromite sand is 1000 DEG C burning, grinding, using sodium peroxide as fluxing agent, by high temperature melting, hot water washing, hydrochloric acid, nitric acid pretreatment of the sample, the direct determination of silica in chromium ore by inductively coupled plasma atomic emission spectrometry. The matrix element sodium into molten specimen test of interference, the results show that the tested elements, adding 1.5 grams of sodium peroxide for detecting small interfering effect. By adding chromium iron matrix, effectively overcome the influence of matrix effects on the results. Silicon a detection limit of 0.0049 mg/L, silica measurement range is 0.010% ~ 6%. The chrome ore standard reference samples, the results are consistent with the standard value, the precision of the method (RSD, n=10) is less than 1%. The conventional weight procedure, take less than long, workload,. This method greatly improves the detection efficiency, meet the need of production.