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微量水分測定儀標准品的選擇

发表时间：2018-10-19 17:31

（1）標准品的選擇
　　用去離子水標定：用去離子水標定滴定劑濃度需要大量的練習和精確的實驗操作以獲得重複的精確的結果。由于使用去離子水量非常小（10?l～20?l），偶然誤差較大，因此推薦多次標定取平均值以確定滴定液的濃度。（常用方法）
　　用水標准品標定：精密稱定水標准品1.0到1.5克，用反稱量法確定其質量，滴定至終點。
（2）標定值的統計計算
　　多次標定結束後，按“方法”鍵，選擇“方法3-水分標定”，確認後選擇微量水分測定儀標定目錄下“4浏覽”查看曆史標定記錄，選擇偏差較大的標定值，按“回零”刪除當前查看的標定值。按“退出”鍵，重新選擇標定目錄下“2統計計算”，確認後會根據所保存的標定值統計計算，並將平均值作爲當前KF試劑的滴定度。按“退出”鍵返回到系統保持狀態，以便進行其他程序。

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