火试金富集-电感耦合等离子体质谱法测定铜精矿中金钯铂

采用铅火试金法富集铜精矿中的贵金属、微波消解溶解得到贵金属合粒，并利用电感耦合等离子体质谱法（ICP-MS）对得到的溶液进行检测。在火试金条件的选择中，分别对熔融时间、灰吹温度和灰吹时间进行了讨论，确定了这三个参数的最佳值分别为15 min、960 ℃和1 h。在微波消解条件的选择中，对溶剂和用量进行了讨论，确定了10 mL王水溶解贵金属合粒效果最佳。此外，还分别就同量异位素、多原子离子、难熔氧化物与双电荷离子产生的干扰及消除进行了讨论。测定了三种铜精矿样品中金、钯、铂元素的含量，检出限分别为0.04、0.05、0.1 ng/g，相对标准偏差为1.2%~4.0%。

Determination of gold,palladium and platinum in copper concentrates by inductively coupled plasma mass spectrometry combined with fire assay preconcentration

An inductively coupled plasma mass spectrometry (ICP-MS) method was adopted for the determination of precious metal in copper concentrate in combination with fire assay preconcentration and microwave digestion method. The optimal fire assay conditions were determined: melting time, 15 min, ash blowing temperature, 960 ℃ and ash blowing time, 1 h. In the selection of microwave digestion conditions, 10 mL of aqua regia was found to be the most optimal for dissolving precious metal. The interference of isobaric elements, polyatomic ions, refractory oxide and doubly charged ions were also discussed, and the elimination method was found out. The content of gold, palladium and platinum in a copper concentrate was discussed. The detection limit was 0.04, 0.05, and 0.1 ng/g. The relative standard deviation was 1.2%-4.0%.