Manganese and chromium ores—Experimental methods for evaluation of quality variation and methods for checking the precision of sampling
IDT ISO 8542:1986
全国生铁及铁合金标准化技术委员会
本标准规定了评定天然或加工锰、铬矿石品质波动的试验方法，及相关标准中所使用的定量系统取样和二级取样时的取样程序定义。同时还规定了定量系统取样和二级取样时校核取样精密度的试验方法。
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