采用硝酸钡作为氧化剂,在预氧化阶段将低价态的S转化为硫酸盐,与其它氧化剂相比可更好将硫定量保留在硼酸盐熔剂中,27.8%的S的RSD为0.61%。Tm作为Ni的内标,Ni的分析准确度和精密度得到明显改善。采用(Li2B4O7:LiBO2=12:22)的混合熔剂,准确测定镍矿中的15中主次痕量元素,最大相对标准偏差为9.4%。 With barium nitrate as the oxidant, the low-valent S is converted to sulfate in the pre-oxidation stage, and the sulfur content is better retained in the borate flux than other oxidizers, with a RSD of 27% for S of 0.61%. Tm Ni as the internal standard, Ni analysis accuracy and precision has been significantly improved. The mixed flux of (Li2B4O7: LiBO2 = 12: 22) was used to determine the primary and secondary trace elements in 15 nickel ores. The maximum relative standard deviation was 9.4%.