| 摘要: |
| 在室温条件下,用1. 0mol·L-1硫酸溶液提取乳油制剂中的烟碱,提取液经分离、稀释后,直接用紫外分光光度法测定。结果发现,该方法对烟碱溶液进行测定的准确度与水蒸汽蒸馏-紫外分光光度法基本一致,而对乳油样品测定的准确度和精密度均高于水蒸汽蒸馏-紫外分光光度法,回收率在95. 0%～98. 3%之间。硫酸溶液的浓度以1mol·L-1为宜,硫酸溶液用量为烟碱摩尔数的1. 0～1. 2倍,提取液的分层时间及澄清程度与硫酸溶液加入量有关。 |
| 关键词: 烟碱，乳油制剂，紫外分光光度计，硫酸提取，快速分析 |
| DOI： |
| 分类号:TQ453.307 |
| 基金项目: |
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| A Method to Determine Nicotine Content in Emulsion Concentrat |
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| Abstract: |
| This paper reports an easy method to determine nicotine content in emulsion concentrate (E.C. ) in room temperature.After the nicotine of E.C. is extracted
using water solution of sulphuric acid (H2SO4, 1mol·L-1), the extraction is diluted and
determined with ultra-violet spectrophotometry.The method can get a recovery ratio of
95. 0%～98. 3%.This is amethod with more accuracy and rapidity than the method of
vapour distillation-UV spectrophotometry.Optimum concentration of sulphuric acid is 1
mol·L-1 and the amount(mole number) of itused to extractnicotine is 1. 0～1. 2 times
as much as that of nicotine in sample.The distribution speed and clarification degree of
extraction phase are related to the amount of solution of sulphuric acid added. |
| Key words: nicotine,UV spectrophotometer,sulphuric acid extraction,rapid analysis method |
