重复分析相对偏差.doc

重复分析相对偏差根据DZ/T 0130.32006，检查分析相对偏差、允许相对偏差、合格率计算公式如下：(1)相对偏差(RD)，% (1)式中：xi单次测定值；测定平均值。(2)岩矿试样相对偏差允许限(YC)，% (2)式中：C重复分析相对偏差允许限系数。系数和矿种、分析项目有关。常见矿种修正系数见表1。重复分析试样中某组分平均质量分数，%；YC的计算值30%时，一律按30%执行。矿石分析中，主要成矿元素低于边界品位，一般不计偏差。如客户有要求，由双方协商确定。痕量有色金属、稀有、稀散元素相对偏差允许限系数为1。含量3%、0.23和3%时，YC10%；当0.2%X3%时，YC20%；当X0.2%时，YC100106按4.33%执行；Au100106按7.21%执行；Ag5106按12.4%执行；Ag0.2106按33.4%执行；(4)合格率 (4)合格率要求：内检合格率95%，外检合格率90%。【实例】某白云岩矿MgO基本分析和内检分析结果见表2的D、E栏。由表2可见，各样品均不超差。表2 基本分析内部检查结果表序号样品编号实验室编 号内检编号分析结果(MgO)/%相对偏差(%)合格基本检查CRDYCABCDEFGHIJK1TC0001-195012595030021.0421.000.6721.020.101.42是2TC0001-295012695030121.1221.150.6721.140.071.42是3TC0001-495012895030221.3921.400.6721.400.021.41是4TC0001-595012995030320.2120.250.6720.230.101.45是5TC0001-795013195030420.7820.800.6720.790.051.43是6TC0001-895013295030521.1221.120.6721.120.001.42是7TC0001-1095013495030619.2619.160.6719.210.261.50是8TC0201-195013565030718.1418.110.6718.130.081.55是9TC0201-49501389530821.1221.100.6721.110.051.42是10TC0201-595013995030921.0421.040.6721.040.001.42是11TC0201-995014395031120.9021.000.6720.950.241.42是12TC0201-1095014495031221.0320.930.6720.980.241.42是13TC0401-395014995031321.0521.050.6721.050.001.42是14TC0401-495015095031421.1121.160.6721.140.121.42是15TC0401-695015295031520.6820.590.6720.640.221.44是16TC0401-895015495031621.0121.000.6721.010.021.42是17TC0401-1095015695031721.1021.0