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标准物质的量值确定和期间核查
浏览次数:174发布日期:2019-11-19

懂球帝【LAIYUAN/ZUOZHE】BEINACHUANGLIAN 

标准物质

懂球帝<BIAOZHUNWUZHI>

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1.以纯物质为原料制备的标准物质

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如果没有合适的方法测定主含量,则可以采取杂质扣除法。此时需注意杂质的种类、方法的应用条件、仪器对于不同杂质灵敏度的差异等,并应测定可能存在的所有杂质。如采用色谱归一法,物质的纯度应当足够(99.5%以上),选择的检测器对各类杂质的响应应尽可能相近。

在获得了相对准确可靠的纯度结果和不确定度后,再配制标准物质(通常为标准溶液懂球帝),并应用于实际检测中其次,应根据该物质的化学性质确定合理的期间核查间隔,如对于稳定性差的有机物,期间核查至少应在几个月,甚至几周进行一次,或在使用前重新测定纯度;对于稳定性很好的物质,则可放 宽间隔,半年或一年进行一次都是可行的。

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