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COD消解儀
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使用COD氨氮測定儀應注意哪些事項

2021-01-25 12:47:15

COD氨氮測定儀可直接測定COD及氨氮,COD是利用密封催化消解,然后進行比色法測量。氨氮是采用納氏比色法進行測定。

1.減少樣品在檢測時的相互影響,空白、標樣、樣品 的消解管及管蓋應固定,以提高檢測的準確性,減少操作帶來的誤差。
 

2.COD消解為密閉消解,消解前應上下倒置搖勻,如有漏液,則不能放入消解儀中,消解時必須旋緊消解管蓋,以免漏出腐蝕儀器。
 

3.根據被測樣品的濃度值大小,應選用相對應的標準曲線。  
 

4.由于氧化劑內含有氯離子掩蔽劑,消解后可能會有少量沉淀,比色時,不要搖動消解比色管以免沉淀上浮,造成結果偏差。

5.一般情況下,標準曲線的相關系數r值應在0.990以上,如果所標定的標準曲線的r值低于0.990,說明標準配制有問題或比色操作不規范,應仔細分析,逐一排除。  
 

6.消解比色管必須保持潔凈,避免用手觸及透光面,管子置入比色計前如管外壁 掛有溶液,應用吸水性強的軟紙擦拭干凈,以免造成零點漂移及腐蝕儀器。 
 

7.實驗中所用試劑皆為強酸,切勿直接接觸防止意外燒傷。消解時,切記罩上防護罩,以免發生意外造成對儀器及操作者的傷害。


氨氮測定儀

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