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COD分析儀

COD微波消解儀工作原理

發(fā)布日期:2022-04-18 點擊率:259

    微波密封消解COD測定裝置是用頻率為2450MHZ的電磁波(稱為微波)能量來加熱反應液,在高頻微波能的作用下,反應液分子產生高速磨擦運動,使其溫度迅速升高,另外采用密封消解方式,使其消解罐內部壓力迅速提高到約203kPa。因此不僅縮短了消解時間,而且還可以抑制氯離子被重鉻酸鉀氧化成氯氣,若加入適量的硫酸汞作為掩蔽劑,則可實現(xiàn)對高氯水的COD測定。整個消解過程免冷卻水,減少了冷水管安裝及停水的煩惱。

    水樣在微電腦控制下,在強酸性溶液中,用一定量的重鉻酸鉀氧化水樣中還原性物質,過量的重鉻酸鉀以試亞鐵靈為指示劑,用硫酸亞鐵銨進行滴定,計算出COD Cr值。亦可用比色法,在波長600nm處直接測定反應液中三價鉻濃度,求得水樣的COD Cr值。

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