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| 消解仪－麝香草酚分光光度法测定水中总氮 |
| Determination of Total Nitrogen in Water by Digestion Instrument with Thymol Spectrophotometry |
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| DOI： |
| 中文关键词: 总氮 麝香草酚 分光光度法 水质 |
| 英文关键词: Total nitrogen Thymol Spectrophotometry Water quality |
| 基金项目: |
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| 摘要点击次数: 3181 |
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| 中文摘要: |
| 采用消解仪替代高压蒸汽灭菌器消解水样，用麝香草酚分光光度法替代紫外分光光度法测定总氮。试验表明，方法在0 mg/L～10.0 mg/L范围内线性良好，相关系数R为0.999 9；方法检出限为0.04 mg/L；测定低、中、高质量浓度的标准溶液，RSD为1.1%～5.5%；对3份实际水样进行加标回收试验，回收率为94.6%～98.2%，测定总氮标准品，结果在保证值范围内；用该方法与国标方法同时测定水样，测定结果的相对偏差<5%。 |
| 英文摘要: |
| Total nitrogen in water was determined by digestion instrument thymol spectrophotometry in stead of autoclave digestion UV spectrophotometry.The results showed that there was a good linear relation between the concentrations of nitrate N and the absorption values in the range of 0 mg/L～10.0 mg/L and the correlation coefficient was 0.999 9. The method detection limit was 0.04 mg/L.When determining the standard solution of low,medium and high concentrations,the RSDs ranged from 1.1% to 5.5%,and the recovery rates were 94.6%~98.2%.The relative deviation between the current method and the national criteria was less than 5%. |
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