低温逆王水溶样-电感耦合等离子体原子发射光谱法测定铁矿中硫和磷

铁矿中硫和磷是主要的有害成分,需对其进行准确测定。铁矿样品在低温下用逆王水和溴水溶解后,以P 213.618 nm 和S 182.034 nm作为分析谱线,建立了电感耦合等离子发射光谱测定铁矿石中硫和磷的分析方法。硫和磷检出限分别为0.019 μg/mL和0.004 μg/mL。试验表明:样品中钙、铁和铝对硫和磷的测定基本不产生干扰,铜对硫的测定也无干扰,而对磷的测定有干扰,但可通过扣除左背景的方法消除。对5种铁矿标准样品中硫和磷进行5次测定,测定值与认定值基本一致,相对标准偏差(RSD)分别在0.54%～3.1%和0.40%～3.0%范围。

Determination of sulfur and phosphorus in iron ore by inductively coupled plasma atomic emission spectrometry after sample dissolution with inverse aqua reqia in low temperature

The sulfur and phosphorus are main harmful components in iron ores. Their contents should be accurately determined. In this study, the iron ore sample was dissolved with inverse aqua reqia and bromine water in low temperature. P 213.618 nm and S 182.034 nm were selected as the analysis lines. The determination method of sulfur and phosphorus in iron ore by inductively coupled plasma atomic emission spectrometry was established. The detection limit of sulfur and phosphorus was 0.019 μg/mL and 0.004 μg/mL, respectively. The results indicated that the calcium, iron and aluminum in sample had no interference in the determination of sulfur and phosphorus. Copper did not interfere in the determination of sulfur, but it had interference in the determination of phosphorus, which could be eliminated by deducting the left background. The sulfur and phosphorus in five standard samples of iron ore were determined for five times. The found results were consistent with the certified values. The relative standard deviations (RSDs, n=5) were 0.54%-3.1% and 0.40%-3.0%, respectively.