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譜圖分析之隻出溶劑峰-上海91福利在线观看分析儀器有限公司

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譜圖分析之隻出溶劑峰

更新時間:2021-11-17點擊次數:4170
  91福利片导航网譜圖隻出溶劑峰指溶劑出峰正常,但樣品主成份(溶質)不出峰或出峰很小。其解決措施如下:
 
  1、增加進樣量。分梳進樣時降低分流流量(分流比)。
 
  2、提高量程範圍或降低衰減倍數,設置較高靈敏度檔。
 
  3、重新配製樣品,把樣品濃度控製在0.02∽10%之間。
 
  4、可能溶質與溶劑的沸點差太小,降低色譜柱箱溫度試試。
 
  5、改用與溶質的沸點差較大的溶劑。
 
  6、可能色譜柱對樣品主成份(溶質)的保持力太強,提高色譜柱箱溫度試試,確認溶質從色譜柱溶出。
 
  7、樣品的沸點太高不能直接分析時,需用其他化學方法進行前處理。
 
  8、換用合適的色譜柱。
 
  9、如果樣品的熱穩定性較差,可能會在進樣器內分解或化合,降低進樣器溫度避免出現這種情況。
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