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    淺談1立方米氣候箱做測定酚試劑分光光度法分析步驟你知道嗎?


    今天,環儀儀器從以下幾個方面來說說1立方米氣候箱酚試劑分光光度法分析步驟:

     

         1、采樣:用一個內裝10ml吸收液的大型氣泡吸收管,以0.5L/min~1.0L/min流速,自測試設備的出口氣體中采樣,采樣體積取決于待測氣體中甲醛濃度,一般不低于10L,采樣時,應確保采樣流量不大于設備出口氣體流量的80%,記錄采樣點的溫度和大氣壓力。采樣后樣品在室溫下應在24H內分析

         2、分析步驟:標準曲線的繪制

               10ml具塞比色管,用甲醛標準溶液按表1制備標準系列。

     

                  

          在各管中加入1%硫酸鐵銨溶液0.4ml,搖勻。在不低于18℃的環境中放置15min。用1cm比色皿,在波長630nm下,以水作參比,測定各管溶液的吸光度,以甲醛含量為橫坐標,吸光度為縱坐標,繪制標準曲線,并計算回歸曲線斜率,以斜率倒數作為樣品測定的計算因子Bg

          3、樣品測定

             采樣后,用少量吸收液沖洗吸收管,合并使總體積為10ml,移取5.00ml樣品溶液人比色管中。按繪制標準曲線的操作步驟測定吸光度(A),如果測得的吸光度值超出了標準曲線的線性范圍,側重新移取樣品溶液,稀釋后測定,記錄稀釋因子(D);在每批樣品測定的同時,用5.00ml未采樣的吸收液作試劑空白,測定試劑空白的吸光度(Ao)。

     

    環儀公司專業生產各行各業模擬環境試驗倉,甲醛釋放量環境測試倉VOC環測試倉30立方米空氣凈化器檢測用環境倉空氣凈化器環境測試倉空氣凈化器CADR環境測試倉空氣凈化器性能測試等等。歡迎大家前來咨詢了解。



    咨詢熱線:0769-83482055/15322932685

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    聯系人:宋小姐

     

     

     

     

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