Elton 說：

真暈!!
混淆 混淆 真混淆
手邊有的紅海測試劑快用完了 加購了一組 昨天晚上拿回來
今天該再測測測水質了
結果暈了

新買的測試劑跟手上的是同一批號的紅海鈣測試劑 EXP 1014

老東西測 CA 425
新東西測 CA 550( 第3劑用量1.1ml)

該相信那一個???????????????

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KAKE 說：

不會死sps，不要太離譜，缸子整體狀況ok，數據就參考就好

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riverside 說：

還差真多
多找些朋友幫忙測吧，取最大公約數

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shih87 說：

我目前已用超過四盒Red Sea 鈣，銜接都不錯，沒有發生類似老王的現象。
鈣測試顏色變化很明確，應不會搞錯。測試水樣是同一次由魚缸收集的，還是分開取樣？

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ab333647 說：

以前拿API跟Salifert的鈣測試劑對照過
我量出來差不多(差在精度而已)

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1. The primary standard calcium carbonate should be dried at 150 degrees �C for at least 1 hour. (Note the analytical purity on the bottle.)
2. Prepare a calcium standard solution by accurately weighing 0.35 - 0.4 g of standard calcium carbonate and quantitatively transferring the solid to a 250 mL beaker. (Be able to calculate the number of grams of pure calcium carbonate required to prepare a standard calcium solution that would require ~35 mL of 0.01 M EDTA for titration of a 10 mL aliquot.)
3. Place the beaker in the hood and add 6M HCl dropwise until the sample completely dissolves. Make the volume up to about 50 mL with distilled water.
4. Gently boil the solution for a few minutes to expel excess CO2 being careful not to lose any of the solution.
5. Allow the solution to cool and add two drops of methyl red indicator.
6. Add 6 M NaOH a drop at a time until the methyl red indicator turns yellow (the yellow may be difficult to see but there is no trace of red.)
7. Carefully rinse the beaker with distilled water into a 100 mL volumetric flask to quantitatively transfer all of the calcium solution. Dilute to the mark in the volumetric flask. Mix the solution carefully before continuing.