分光光度法测定饱和盐水中微量杂质
史东升
安邦电化有限公司质监部
组分 | 标样浓度/(mg·L-1) | 测定值/(mg·L-1) | 绝对误差(mg·L-1) | 回收率/% |
AL3+ | 0.0600 | 0.0592 | -0.0008 | 98.67 |
0.1000 | 0.0998 | -0.0002 | 99.80 | |
0.1400 | 0.1404 | 0.0004 | 100.29 | |
0.1600 | 0.1617 | 0.0017 | 101.06 | |
0.2200 | 0.2186 | -0.0014 | 99.36 | |
Si(IV) | 0.5000 | 0.5050 | 0.0050 | 101.00 |
1.000 | 0.9946 | -0.0054 | 99.46 | |
1.500 | 1.511 | 0.011 | 100.73 | |
3.000 | 2.987 | -0.013 | 99.57 | |
3.500 | 3.476 | -0.024 | 99.31 | |
Fe3+ | 0.2000 | 0.2006 | 0.0006 | 100.30 |
0.4000 | 0.4011 | 0.0011 | 100.28 | |
0.6000 | 0.5894 | -0.0106 | 98.23 | |
0.8000 | 0.8064 | 0.0064 | 100.80 | |
0.9000 | 0.8923 | -0.0077 | 99.14 | |
I- | 0.3000 | 0.3025 | 0.0025 | 100.83 |
0.5000 | 0.4984 | -0.0016 | 99.68 | |
0.6000 | 0.5956 | -0.0044 | 99.27 | |
0.7000 | 0.7068 | 0.0068 | 100.97 | |
0.8000 | 0.7971 | -0.0029 | 99.64 |
表2 同一盐不样品中不同杂质精密度实验结果
组分 | 5次平行测定值/(mg·L-1) | 平均值(mg·L-1) | RSD/% | ||||
1 | 2 | 3 | 4 | 5 | |||
AL3+ | 0.0472 | 0.0480 | 0.0476 | 0.0468 | 0.0476 | 0.0474 | 0.96 |
Si(IV) | 3.617 | 3.630 | 3.624 | 3.610 | 3.624 | 3.621 | 0.21 |
Fe3+ | 0.475 | 0.479 | 0.483 | 0.479 | 0.483 | 0.480 | 0.70 |
I- | 0.386 | 0.387 | 0.389 | 0.384 | 0.386 | 0.386 | 0.47 |