| 烟叶中钾氯常规法测定前处理的改进研究 |
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| 引用本文： | 焦桂珍,宋鹏飞,刘学芝,彭丽丽,张凤侠,沈铮,韩富根.烟叶中钾氯常规法测定前处理的改进研究[J].安徽农业科学,2008,36(22). |
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| 作者姓名： | 焦桂珍 宋鹏飞 刘学芝 彭丽丽 张凤侠 沈铮 韩富根 |
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| 作者单位： | 河南农业大学农学院,河南郑州,450002 |
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| 摘 要： | 目的]更好地测定烟叶中钾、氯的含量。方法]先选用合适的酸提取钾、氯,再用活性炭进行脱色,改进钾、氯常规方法测定的前处理,建立了同一待测液同时测定烟叶样品中钾和氯含量的方法。结果]使用25 ml浓度0.2 mol/L H2SO4提取10~25 min,能够把烟叶中的钾、氯提取出来,且脱色效果较好。当样品和活性炭质量比为1∶2时,脱色效果较好。25~35℃条件下可以制备待测液。改进方法测定的钾、氯的变异系数分别为2.70%~2.97%,1.09%~1.27%,钾、氯的回收率分别为97.7%~98.4%、97.3%~100.0%。结论]采用H2SO4提取、活性炭脱色法测定烟叶中钾、氯含量的精密度较高,测定结果可靠,与常规方法相比,步骤简便,测定效率高,节约成本,便于普及。
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| 关 键 词： | 烤烟 钾 氯 脱色 |
Preliminary Research on Improvement of Pretreatment for Routine Method of Determining Potassium and Chlorine in Tobacco Leaf |
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| JIAO Gui-zhen et al.Preliminary Research on Improvement of Pretreatment for Routine Method of Determining Potassium and Chlorine in Tobacco Leaf[J].Journal of Anhui Agricultural Sciences,2008,36(22). |
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| Authors: | JIAO Gui-zhen |
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| Abstract: | Objective] The aim was to determine accurately the content of potassium and chlorine in tobacco leaf.Method] The appropriate acid was chosen to extract potassium and chlorine first,and then decoloration was done with active carbon,the pretreatment of the routine method for determination of potassium and chlorine was improved,the method was established for the same testing solution to simultaneously determine the content of potassium and chlorine in tobacco leaf sample.Result] Extracting by using 25 ml,0.2 mol/L H2SO4 for 10-25 min,the potassium and chlorine in tobacco leaf could be extracted with a good decoloration effect.When the mass ratio of sample and active carbon was 1∶2,the decoloration effect was good.The solution to be tested could be prepared under the conditions of 25-35 ℃.The variation coefficient of potassium and chlorine that being determined with improved method were 2.70%-2.97% and 1.09%-1.27% resp.,and the recovery rate of potassium and chlorine were 97.7%-98.4% and 97.3%-100.0% resp.Conclusion] Adopting the methods of H2SO4 extraction and active carbon decoloration to determine the content of potassium and chlorine in tobacco leaf could get the high precision,with reliable determination result.Compared with routine method,the former was in simple process,high determining efficiency, saved cost,and convenient for popularization. |
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| Keywords: | Flue-cured tobacco Potassium Chlorine Decoloration |
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