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標準物質的量值確定和期間核查
瀏覽次數:71發布日期:2019-11-19

【LAIYUAN/ZUOZHE】BEINACHUANGLIAN 

標準物質

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1.以純物質為原料制備的標準物質

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如果沒有合適的方法測定主含量,則可以采取雜質扣除法。此時需注意雜質的種類、方法的應用條件、儀器對于不同雜質靈敏度的差異等,并應測定可能存在的所有雜質。如采用色譜歸一法,物質的純度應當足夠(99.5%以上),選擇的檢測器對各類雜質的響應應盡可能相近。

在獲得了相對準確可靠的純度結果和不確定度后,再配制標準物質(通常為標準溶液),并應用于實際檢測中其次,應根據該物質的化學性質確定合理的期間核查間隔,如對于穩定性差的有機物,期間核查至少應在幾個月,甚至幾周進行一次,或在使用前重新測定純度;對于穩定性很好的物質,則可放 寬間隔,半年或一年進行一次都是可行的。

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2.JITIBIAOZHUNWUZHI

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