THE SOLUTION
重金属 | Pb | Cd | Cu | As | Hg |
《中国药典》最低限值 | 5 | 0.3 | 20 | 2 | 0.2 |
PHECDA 检出限① | 0.07 | 0.05 | 0.1 | 0.06 | 0.2 |
标准样品 Mn Fe Cu Zn As Pb Br Rb Sr Cd |
Mn | Fe | Cu | Zn | As | Pb | Br | Rb | Sr | Cd |
METAL-DJTZK-006 | —— | —— | —— | —— | —— | —— | —— | —— | —— | 0.663±0.051 |
GBW10020 | 30.5±1.5 | 480±30 | 6.6±0.5 | 18±2 | 1.1±0.2 | 9.7±0.9 | 3.4±0.5 | 3.0±0.2 | 170±10 | 0.17±0.02 |
仪器型号 | As | Pb | Cd | ||||||
标准值 | 测定结果 (mg/kg) |
相对误差 | 标准值 | 测定结果 (mg/kg) |
相对误差 | 标准值 | 测定结果 (mg/kg) |
相对误差 | |
(%) | (%) | (%) | |||||||
ICP-MS | 0.252 | 0.221 | -12% | 0.57 | 0.67 | 18% | 0.67 | 0.728 | 8.7% |
HS XRF | 0.236 | -6% | 0.512 | -10% | 0.633 | -5.5% |
五、精密
表4 有害元素的含量与相对标准偏差关系表
As | Pb | Cd | |||
RSD/% | 含量/(mg/kg) | RSD/% | 含量/(mg/kg) | RSD/% | 含量/(mg/kg) |
5 | 0.72 | 5 | 1.32 | 5 | 0.62 |
10 | 0.36 | 10 | 0.64 | 10 | 0.31 |
20 | 0.18 | 20 | 0.31 | 20 | 0.15 |
30 | 0.12 | 30 | 0.20 | 30 | 0.10 |
1.8 | 2* | 1.4 | 5* | 10 | 0.3* |
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[3] 马兴,张静,柴铭骏,肖亚兵,高健会,滕飞.一种中草药荧光光谱重金属检测装置和检测方法.专利号:ZL 2021 1 1471681.6