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Determination and Relationship of Ammonia Nitrogen, Nitrite Nitrogen, Nitrate Nitrogen and Total Nitrogen in Upstream Reservoir Water
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摘要: 采用紫外分光光度法测定上游水库固定监测点位近两年采集样品的总氮、硝酸盐氮、氨氮、亚硝酸盐氮含量. 对测试结果进行分析比较, 探讨了上游水库水中总氮、硝酸盐氮、氨氮、亚硝酸盐氮的关系, 从而为上游水库水质数据分析和综合评价提供一定参考.Abstract: The total nitrogen, nitrate nitrogen, ammonia nitrogen, and nitrite nitrogen in the upstream reservoir water were determined by the spectrophotometry. The contents of total nitrogen, nitrate nitrogen, ammonia nitrogen, and nitrite nitrogen in the samples collected from the fixed monitoring point of the upstream reservoir in recent two years were determined using the ultraviolet spectrophotometry. The test results were analyzed and compared, and the relationships among the total nitrogen, nitrate nitrogen, ammonia nitrogen, and nitrite nitrogen in the upstream reservoir water were discussed, thus a certain reference for the data analysis and comprehensive evaluation of water quality data in upstream reservoirs is provided.
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Key words:
- upstream reservoir /
- trinitrogen /
- total nitrogen
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图 2 亚硝酸盐氮标准曲线及计算公式
Figure 2. Standard curve and calculation formula of nitrite nitrogen
图 3 硝酸盐氮标准曲线及计算公式
Figure 3. Standard curve and calculation formula of nitrate nitrogen
表 1 质控样品统计
Table 1. Statistics of quality control samples
分析项目 标准物质批号 真值范围 有效期 测定值1/(mg/L) 测定值2/(mg/L) 平均值/(mg/L) 相对偏差/% 氨氮 170509 (0.127±0.006) mg/L 2022.09 0.131 0.125 0.124 2.34 亚硝酸盐氮 190645 (89.2±4.5) μg/L 2022.11 0.091 0.087 0.089 2.13 硝酸盐氮 200711 (10.8±0.4) mg/L 2023.06 10.9 10.5 10.7 1.87 总氮 190221 (2.07±0.11) mg/L 2022.09 2.07 1.97 2.02 2.48 
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表 2 不同批次和同一批次超纯水放置3 d后测得吸光度空白对比
Table 2. Comparison of absorbance blank between different batches and same batch of ultra-pure water after 3 days
波长/nm 1# 1#-3d 2# 2#-3d 3# 3#-3d 4# 4#-3d 220 0.000 0.018 0.004 0.016 0.001 0.012 0.002 0.010 275 0.000 0.002 0.000 -0.001 0.000 0.003 0.000 -0.002 420 0.024 0.026 0.022 0.023 0.021 0.023 0.022 0.024 540 0.003 0.004 0.002 0.004 0.004 0.005 0.003 0.004
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表 3 2020年上游水库水中总氮、硝酸盐氮、氨氮、亚硝酸盐氮含量分析
Table 3. Analysis of total nitrogen, nitrate nitrogen, ammonia nitrogen and nitrite nitrogen in upstream reservoir water in 2020
编号 采样日期 氨氮质量浓度/(mg/L) 占总氮比/% 亚硝酸盐氮质量浓度/(mg/L) 占总氮比/% 硝酸盐氮质量浓度/(mg/L) 占总氮比/% 总氮质量浓度/(mg/L) 1 2020-03-16 0.140 21.2 0.006 0.9 0.41 62.1 0.66 2 2020-04-09 0.170 35.4 0.006 1.3 0.28 58.3 0.48 3 2020-06-04 0.140 15.2 0.007 0.8 0.62 67.4 0.92 4 2020-09-09 0.080 15.4 0.008 1.5 0.42 80.8 0.52 5 2020-10-14 0.060 9.1 0.004 0.6 0.60 90.9 0.66 6 2020-11-10 0.122 15.8 0.013 1.7 0.51 66.2 0.77
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表 4 2021年上游水库水中总氮、硝酸盐氮、氨氮、亚硝酸盐氮含量分析
Table 4. Analysis of total nitrogen, nitrate nitrogen, ammonia nitrogen and nitrate nitrogen in upstream reservoir water in 2021
编号 采样日期 氨氮质量浓度/(mg/L) 占总氮比/% 亚硝酸盐氮质量浓度/(mg/L) 占总氮比/% 硝酸盐氮质量浓度/(mg/L) 占总氮比/% 总氮质量浓度/(mg/L) 1 2021-03-08 0.040 4.2 0.014 1.5 0.78 81.3 0.96 2 2021-04-06 0.030 12.0 0.011 4.4 0.18 72.0 0.25 3 2021-06-03 0.040 6.3 0.008 1.3 0.26 40.6 0.64 4 2021-09-04 0.030 5.3 0.006 1.1 0.42 73.7 0.57 5 2021-10-09 0.030 6.5 0.003 0.7 0.34 73.9 0.46 6 2021-11-08 0.140 18.7 0.015 2.0 0.56 74.7 0.75
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