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熱門產品: 二手離子色譜系統,二手氣相色譜分析儀

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  • 2018

    1-26

    江西氣相色譜儀毛細管柱安裝注意事項

    江西氣相色譜儀以氣體作為流動相。當樣品被送入進樣器后由載氣攜帶進入色譜柱。由于樣品中各組份在色譜柱中的流動相和固定相間分配或吸附系數的差異。在載氣的沖洗下,各組份在兩相間作反復多次分配,使各組份在色譜柱中得到分離,然后由接在柱后的檢測器根據組份的物理化學性,將各組份按順序檢測出來。江西氣相色譜儀的毛細管柱安裝注意事項:1.先將固定螺母和密封墊套在柱頭上,此時應將柱頭朝下,避免密封墊碎屑進入柱管而造成堵塞。將石墨墊套在柱頭后,應將柱頭截去1-2cm,可用專門的柱切割器,也可用一...
  • 2017

    12-27

    捷島氣相色譜儀的載氣度選擇

    操作捷島氣相色譜儀如何選用不同氣體度的氣源做載氣和輔助氣體,根據每一個用戶具體使用的那一類(高,中,抵擋)儀器,選擇什么樣度的氣體,這確實是一個比較復雜的問題。原則上講,選擇氣體度時,主要取決于分析對象;色譜柱中填充物以及檢測器。建議在滿足分析要求的前提下,盡可能選用度較高的氣體。這樣不但會提高捷島氣相色譜儀的高靈敏度,而且會延長色譜柱,整臺儀器(氣路控制部件,氣體過濾器)的壽命。捷島氣相色譜儀對氣體度選擇的一般原則:1.從分析角度講,微量分析比常量分析要求高,也就是說,氣體...
  • 2017

    11-27

    二手質譜儀廠家談小型質譜儀研制關鍵技術

    二手質譜儀廠家介紹質譜儀是將物質粒子(原子、分子)電離成離子,通過適當電場或磁場將它們分離,并檢測其強度進行定性、定量分析的儀器。因具有直接測量的本質和高分辨、高靈敏、大通量、高準確度的性,質譜儀在生命科學、材料科學、食品安全、環境監測、醫療衛生、安全等領域具有不可替代的作用和舉足輕重的地位。近年來,隨著國內外質譜技術飛速發展,質譜儀市場需求迅猛,成為分析領域重要的儀器。在我國,受質譜儀核心技術“空心化”的制約,國內質譜儀市場一直被國外公司壟斷,限制了相關領域的創新。二手質譜...
  • 2017

    11-6

    火焰分光光度計的應用

    火焰分光光度計廣泛用于醫療衛生的臨床化驗及病理研究,還適用于農業、工業、食品行業對鉀、鈉、鋰、鈣的測定,并具有對精神病患者服用鋰鹽的檢測功能。主要用于分析微量到痕量級的無機元素,可以完成定性和定量分析,具有檢出限低、選擇性好、精密度高、抗干擾能力強等點??招年師籼峁┕庠?,待測元素通過原子化后對征波長輻射產生吸收,通過測定此吸收的大小來計算出待測元素的含量。在分析過程中影響測量的可變因素多,各種測量條件不易重復,對測定的靈敏度和準確度影響較大。具體分析試樣時,試樣溶液的溫度、試...
  • 2017

    10-28

    博迅滅菌器的安全使用準則

    一、博迅滅菌器的操作規程1.滅菌器必須放置在結實的水平面上;2.在外層鍋內加適量的水,將需要滅菌的物品放入內層鍋,蓋好鍋蓋并對稱地扭緊螺旋;3.加熱使鍋內產生蒸氣,當壓力表指針達到一定壓力值時,打開排氣閥,將冷空氣排出,滅菌器此時壓力表指針下降,當指針下降零時,即將排氣閥關好;4.繼續加熱,鍋內蒸氣增加,壓力表指針又上升,當鍋內壓力增加到所需壓力時,將火力減小,按所滅菌物品的點,使蒸氣壓力維持所需壓力一定時間,然后將滅菌器斷電或斷火,讓其自然冷后再慢慢打開排氣閥以排除余氣,然...
  • 2017

    9-27

    淺述普析紫外分光光度計的主要實踐

    普析紫外分光光度計主要由輻射源(光源)、色散系統、檢測系統、吸收池、數據處理機、自動記錄器及顯示器等部件組成。普析紫外分光光度計的主要實踐領域:1.檢定物質根據吸收光譜圖上的一些征吸收,別是大吸收波長和摩爾吸收系數是檢定物質的常用物理參數。這在藥物分析上就有著很廣泛的應用。在國內外的藥典中,已將眾多的藥物紫外吸收光譜的大吸收波長和吸收系數載入其中,為藥物分析提供了很好的手段。2.與標準物及標準圖譜對照將分析樣品和標準樣品以相同濃度配制在同一溶劑中,在同一條件下分別測定紫外可見...
  • 2017

    9-25

    離子色譜儀的簡介

    離子色譜儀是液相色譜的一種,故又稱離子色譜或現代離子色譜,其有別于傳統離子交換色譜柱色譜的主要是樹脂具有很高的交聯度和較低的交換容量,進樣體積很小,用柱塞泵輸送淋洗液通常對淋出液進行在線自動連續電導檢測。離子色譜儀工作原理分離的原理是基于離子交換樹脂上可離解的離子與流動相中具有相同電荷的溶質離子之間進行的可逆交換和分析物溶質對交換劑親和力的差別而被分離。適用于親水性陰、陽離子的分離。1、離子色譜分離離子色譜分離主要是應用離子交換的原理,采用低交換容量的離子交換樹脂來分離離子,...
  • 2017

    8-28

    二手質譜儀的一些較為重要的應用

    二手質譜儀的質譜分析法主要是通過對樣品的離子的質荷比的分析而實現對樣品進行定性和定量的一種方法。因此,二手質譜儀都必須有電離裝置把樣品電離為離子,有質量分析裝置把不同質荷比的離子分開,經檢測器檢測之后可以得到樣品的質譜圖,由于有機樣品,無機樣品和同位素樣品等具有不同形態、性質和不同的分析要求,所以,所用的電離裝置、質量分析裝置和檢測裝置有所不同。但是,不管是哪種類型的質譜儀,其基本組成是相同的。都包括離子源、質量分析器、檢測器和真空系統。二手質譜儀主要的使用是別離同位素并測定...
  • 2017

    7-25

    二手離子色譜系統的樣品收集與保存

    二手離子色譜系統可以進行抑制型或非抑制型電導檢測,它由淋洗液、高壓泵、進樣閥、保護柱/分離柱、抑制器、電導池和數據處理系統組成。先分析已知組成和濃度的標準樣品溶液,由數據處理系統生成校正曲線,再分析經過必要前處理的樣品溶液,數據處理系統將其結果與先前生成的校正曲線進行比較,完成定性/定量的計算,得到樣品結果。二手離子色譜系統樣品的收集和保存:樣品收集在用去離子水清洗的高密度聚乙烯瓶中。不要用強酸或洗滌劑清洗該容器,這樣做會使許多離子在瓶壁上,對分析帶來干擾。如果樣品不能在采集...
  • 2017

    7-3

    旋光儀簡介及維護

    旋光儀,其定義為測定旋光性物質的旋光度的儀器。機械工程是其應用的一級學科,光學儀器為二級學科。通過對樣品旋光度的測量,可以分析確定物質的濃度、含量及度等。廣泛應用在制藥、藥檢、制糖、食品、香料、味精及化工、石油等工業生產,科研、教學部門。用于化驗分析或過程質量的控制。儀器維護(1)旋光儀應放在通風干燥和溫度適宜的地方,以免受潮發霉。(2)旋光儀連續使用時間不宜超過4小時。如果使用時間較長,中間應關熄10~15分鐘,待鈉光燈冷卻后再繼續使用,或用電風扇吹打,減少燈管受熱程度,以...
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