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              紅外水分儀原理及應用介紹

              文章出處:未知人氣: 78 發布時間:2019-01-14 09:53

                紅外水分儀可以是工業生產的控制分析,也可是工農業產品的質量檢定; 可以從成噸計的產品中測定水分也可在實驗室中僅用數微升試液進行水分分析; 可以是含水量達百分之幾至幾十的常量水分分析,也可是含水量僅為百萬分之一以下的痕量水分分析等等。


                紅外水分儀方法—般可分為兩大類,即物理分析這和化學分析法。經典水分分析方法已逐漸被各種水分分析方法所代替, 目前市場上主要存在的水分測定儀主要有以下5種

                1、水分測定儀:

                卡爾費休法簡稱費休法,是1935年卡爾費休(KarlFischer)提出的測定水分的容量分拆方法。費休法是測定物質水分的各類化學方法中,對水zui為專一、zui為準確的方法。雖屬經典方法但經過近年改進,提高了準確度,擴大了測量范圍,已被列為許多物質中水分測定的標準方法。

                費休法屬碘量法,其基本原理是利用碘氧化二氧化硫時,需要—定量的水參加反應:

                12十S02十2H2O=2HI十H2SO4

                上述反應是可逆的。為了使反應向正方向移動并定量進行,須加入堿性物質。實驗證明,吡啶是zui適宜的試劑,同時吡啶還具有可與碘和二氧化硫結合以降低二者蒸氣壓的作用。因此,試劑必須加進甲醇或另一種含活潑OH 基的溶劑,使硫酸酐吡啶轉變成穩定的甲基硫酸氫吡啶。

                2、紅外水分儀:

                紅外線加熱機理:當遠紅外線輻射到一個物體上時,可發生吸收、反射和透過。但是,不是所有的分子都能吸收遠紅外線的,只有對那些顯示出電的極性分子才能起作用。水,有機物質和高分子物質具有強烈的吸收遠紅外線的性能。當這些物質吸收遠紅外線輻射能量并使其分子,原子固有的振動和轉動的頻率與遠紅外線輻射的頻率相一致時,極容易發生分子、原子的共振或轉動,導致運動大大加劇,所轉換成的熱能使內部升高溫度,從而使得物質迅速得到軟化或干燥。 一般的加熱方法是利用熱的傳導和對流,需要通過媒質傳播,速度慢,能耗大,而遠紅外線加熱是用熱的輻射,中間無需媒質傳播。同時,由于輻射能與發熱體溫度的4次方成正比,因此,不僅節約能源而且速度快、效率高。此外,遠紅外線具有一定的穿透能力,由于被加熱干燥的物質在一定深度的內部和表層分子同時吸收遠紅外輻射能,產生自發熱效應,使溶劑或水分子蒸發,發熱均勻,從而避免了由于熱脹程度不同而產生的形變和質變,使物質外觀、物理機械性能、牢度和色澤等保持完好。

                紅外水分儀主要由紅外輻射加熱器和電子天平確定其精度和穩定性. (紅外輻射加熱器:鎢絲真空管可輻射近紅外線,碳化硅屬長波長的遠紅外輻射加熱器, 石英玻璃和陶瓷紅外加熱器能輻射中紅外線)

                紅外水分儀水分測定基準的公認標準測定法的「干燥減量法」極其類似的加熱干燥、質量測定的紅外線水分儀。公認標準測定法的「干燥減量法」也被稱之為(105°C?5小時法) 、(135°C3小時法) 等,通過在干燥機中放入樣品進行長時間的加熱干燥,來精確的測定干燥前與干燥之后的質量變化,以此計算出水分量。為此,需要測定人員對設備和技術非常精通。由于測定需要較長的時間,因此快速測定大量的樣品比較困難。所以,對于高準確度的針對多種多樣的樣品進行測定而言,除紅外線水分計之外不作他想。雖然也有一些其他的電氣以及光學的測定方法,但是,都屬于限定測定對象的專用儀器。從通用性的角度而言,都遠不及紅外水分計。

                紅外水分儀適用范圍:可以測定谷物、淀粉、面粉、干面、釀造品、海產品、魚類加工品、食用肉類加工品、調料、點、心、乳制品、干燥食品、植物油等食品相關物品,藥品、礦石砂、焦碳、玻璃原料、水泥、化學肥料、紙、紙漿、棉、各種纖維等的工業制品等。

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