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In-factory testing of chloride ions in urea for urea-to-ammonia hydrolysis systems in power plants is a crucial task, and how to quickly and accurately detect chloride ions content remains an urgent problem to be solved. This study has proposed a new method for determining the mass concentration of chlorides in urea using silver chloride spectrophotometry. This method is simple and fast, capable of detecting the chloride content in a set of urea samples in about 20 minutes, with a detection range of 0.07 mg/L to 2.00 mg/L and a detection limit of 0.02 mg/L. Eighteen repeated tests were conducted on a 10% urea solution with a chloride ion mass concentration of approximately 0.05 mg/L. The results indicated a relative standard deviation of 8.30%. The recovery rate of spiked tests in the 10% urea solution ranged from 86% to 110%. Both the accuracy and sensitivity of this method meet the quality requirements for urea used in the urea-to-ammonia hydrolysis systems in thermal power plants, making it a suitable method for determining chlorides in urea.
, authors=Songyan CAO
1, Zhenzhen MA
1, Jie LI
2, Yue QIAO
1, Jun YANG
1, Wenzhong CHEN
3, Shuang HAN
1, Yichao MA
1, Tong WANG
1, Fei SONG
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研究建立了一种基于氯化银分光光度法测定尿素中氯化物质量浓度的新方法。该方法具有操作简单、快速等特点,一组尿素样品中的氯化物检测可在20 min内完成。检测范围在0.07~2.00 mg/L,检出限为0.02 mg/L,针对氯离子质量浓度约0.05 mg/L的10%尿素溶液进行18次重复检测。结果显示,相对标准偏差为8.30%,对10%尿素溶液的氯离子检测回收率在86%~110%。该方法准确度、灵敏度均满足火电厂对尿素水解制氨系统用尿素质量的要求,可作为尿素中氯化物含量的测定方法。
, authors=曹松彦
1, 马珍珍
1, 李杰
2, 乔越
1, 杨俊
1, 陈文中
3, 韩霜
1, 马翼超
1, 王彤
1, 宋飞
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3.Zhanjiang Zhongyue Energy Co., Ltd., Zhanjiang 524012, China), AuthorCompanyExt(id=1295064919632797828, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, companyId=1295064919616020610, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.湛江中粤能源有限公司,广东 湛江 524012)])], figs=[ArticleFig(id=1295064923923570880, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Fig.1, caption=
The crystals (NaCl) deposited on urea hydrolyzer coil of a power plant, figureFileSmall=gi4BOi/7A7moKCgHL1L/Og==, figureFileBig=FZElVdItXVb/yAOdiG1AXw==, tableContent=null), ArticleFig(id=1295064923990679745, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=图1, caption=
某电厂尿素水解器盘管沉积结晶物(NaCl), figureFileSmall=gi4BOi/7A7moKCgHL1L/Og==, figureFileBig=FZElVdItXVb/yAOdiG1AXw==, tableContent=null), ArticleFig(id=1295064924233949378, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Fig.2, caption=
The stress corrosion rupture of urea hydrolyzer coil in a power plant (caused by Cl–), figureFileSmall=4i91n9SYt7a+djtQT1tlMw==, figureFileBig=9hFDJ3QLMwvNr7F7v07IRQ==, tableContent=null), ArticleFig(id=1295064924330418371, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=图2, caption=
某电厂尿素水解器盘管应力腐蚀破裂(Cl–导致), figureFileSmall=4i91n9SYt7a+djtQT1tlMw==, figureFileBig=9hFDJ3QLMwvNr7F7v07IRQ==, tableContent=null), ArticleFig(id=1295064924414304452, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Fig.3, caption=
Spectral scan curve (1 mg/L Cl–-AgCl suspension), figureFileSmall=w5Yhcs9SbxJF9t1qmvVRPA==, figureFileBig=tQZOvXvHLxjIsv8h7TEjTw==, tableContent=null), ArticleFig(id=1295064924519162053, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=图3, caption=
光谱扫描曲线(1 mg/L Cl–的AgCl悬浊液), figureFileSmall=w5Yhcs9SbxJF9t1qmvVRPA==, figureFileBig=tQZOvXvHLxjIsv8h7TEjTw==, tableContent=null), ArticleFig(id=1295064924636602566, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Fig.4, caption=
The absorbance curve over time at a wavelength of 420 nm (1 mg/L Cl–-AgCl suspension), figureFileSmall=zqiyDyBPJ4SCg8GMGvAtkQ==, figureFileBig=JD3DHCXwATbe8HHiHvsF2A==, tableContent=null), ArticleFig(id=1295064924707905735, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=图4, caption=
波长420 nm下吸光度随时间变化曲线, figureFileSmall=zqiyDyBPJ4SCg8GMGvAtkQ==, figureFileBig=JD3DHCXwATbe8HHiHvsF2A==, tableContent=null), ArticleFig(id=1295064924779208904, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Fig.5, caption=
Standard working curve (30 mm cuvette), figureFileSmall=iND8hZXYPbJDYragjm/45g==, figureFileBig=EnskFeSFj1Oz4Rl/mHFoaQ==, tableContent=null), ArticleFig(id=1295064924854706377, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=图5, caption=
标准工作曲线(30 mm比色皿), figureFileSmall=iND8hZXYPbJDYragjm/45g==, figureFileBig=EnskFeSFj1Oz4Rl/mHFoaQ==, tableContent=null), ArticleFig(id=1295064924917620938, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Tab.1, caption=
The absorbance at different wavelengths (L=100 mm)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 波长/ nm |
|---|
| 360 | 420 | 660 | 810 |
|---|
| 氯离子质量浓度为0时吸光度 | 0.037 | 0.024 | 0.014 | 0.010 |
| 0.036 | 0.024 | 0.014 | 0.010 |
| 0.038 | 0.025 | 0.015 | 0.011 |
| 氯离子质量浓度为0.2 mg/L时吸光度 | 0.161 | 0.120 | 0.054 | 0.035 |
| 0.161 | 0.121 | 0.055 | 0.035 |
| 0.162 | 0.121 | 0.055 | 0.036 |
| 氯离子质量浓度为0.4 mg/L时吸光度 | 0.292 | 0.225 | 0.105 | 0.068 |
| 0.293 | 0.226 | 0.106 | 0.068 |
| 0.293 | 0.226 | 0.106 | 0.068 |
| 氯离子质量浓度为0.6 mg/L时吸光度 | 0.364 | 0.282 | 0.239 | 0.189 |
| 0.363 | 0.282 | 0.239 | 0.190 |
| 0.364 | 0.282 | 0.240 | 0.190 |
| 氯离子质量浓度为1.0 mg/L时吸光度 | 0.565 | 0.459 | 0.386 | 0.343 |
| 0.564 | 0.458 | 0.386 | 0.344 |
| 0.564 | 0.459 | 0.386 | 0.344 |
| 氯离子质量浓度为2.0 mg/L时吸光度 | 0.974 | 0.865 | 0.606 | 0.502 |
| 0.970 | 0.864 | 0.607 | 0.503 |
| 0.969 | 0.864 | 0.608 | 0.505 |
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实验不同波长下吸光度(L=100 mm)
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| 项目 | 波长/ nm |
|---|
| 360 | 420 | 660 | 810 |
|---|
| 氯离子质量浓度为0时吸光度 | 0.037 | 0.024 | 0.014 | 0.010 |
| 0.036 | 0.024 | 0.014 | 0.010 |
| 0.038 | 0.025 | 0.015 | 0.011 |
| 氯离子质量浓度为0.2 mg/L时吸光度 | 0.161 | 0.120 | 0.054 | 0.035 |
| 0.161 | 0.121 | 0.055 | 0.035 |
| 0.162 | 0.121 | 0.055 | 0.036 |
| 氯离子质量浓度为0.4 mg/L时吸光度 | 0.292 | 0.225 | 0.105 | 0.068 |
| 0.293 | 0.226 | 0.106 | 0.068 |
| 0.293 | 0.226 | 0.106 | 0.068 |
| 氯离子质量浓度为0.6 mg/L时吸光度 | 0.364 | 0.282 | 0.239 | 0.189 |
| 0.363 | 0.282 | 0.239 | 0.190 |
| 0.364 | 0.282 | 0.240 | 0.190 |
| 氯离子质量浓度为1.0 mg/L时吸光度 | 0.565 | 0.459 | 0.386 | 0.343 |
| 0.564 | 0.458 | 0.386 | 0.344 |
| 0.564 | 0.459 | 0.386 | 0.344 |
| 氯离子质量浓度为2.0 mg/L时吸光度 | 0.974 | 0.865 | 0.606 | 0.502 |
| 0.970 | 0.864 | 0.607 | 0.503 |
| 0.969 | 0.864 | 0.608 | 0.505 |
), ArticleFig(id=1295064925089587404, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Tab.2, caption=
The mass concentrations of chloride ions detected by Hitachi U-2900 spectrophotometer at different pH values
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| pH值 | A0 | As | As-A0 | 氯离子质量浓度/(mg·L–1) |
|---|
| | | |
| 5.39 | 0 | 0.194 | 0.194 | 1.21 |
| 3.42 | 0.001 | 0.183 | 0.182 | 1.14 |
| 2.63 | 0.002 | 0.215 | 0.213 | 1.33 |
| 2.20 | 0.003 | 0.285 | 0.282 | 1.76 |
| 1.99 | 0.003 | 0.299 | 0.296 | 1.85 |
| 1.41 | 0.003 | 0.314 | 0.311 | 1.95 |
| 1.26 | 0.001 | 0.317 | 0.316 | 1.98 |
| 1.13 | 0 | 0.311 | 0.311 | 1.95 |
| 1.06 | 0 | 0.302 | 0.302 | 1.89 |
| 0.89 | 0.001 | 0.307 | 0.306 | 1.92 |
), ArticleFig(id=1295064925186056397, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=表2, caption=
不同pH值下氯离子质量浓度日立U2900分光光度计测定结果
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| pH值 | A0 | As | As-A0 | 氯离子质量浓度/(mg·L–1) |
|---|
| | | |
| 5.39 | 0 | 0.194 | 0.194 | 1.21 |
| 3.42 | 0.001 | 0.183 | 0.182 | 1.14 |
| 2.63 | 0.002 | 0.215 | 0.213 | 1.33 |
| 2.20 | 0.003 | 0.285 | 0.282 | 1.76 |
| 1.99 | 0.003 | 0.299 | 0.296 | 1.85 |
| 1.41 | 0.003 | 0.314 | 0.311 | 1.95 |
| 1.26 | 0.001 | 0.317 | 0.316 | 1.98 |
| 1.13 | 0 | 0.311 | 0.311 | 1.95 |
| 1.06 | 0 | 0.302 | 0.302 | 1.89 |
| 0.89 | 0.001 | 0.307 | 0.306 | 1.92 |
), ArticleFig(id=1295064925282525390, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Tab.3, caption=
The mass concentrations of chloride ions detected by 723C spectrophotometer at different pH values
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| pH值 | As-A0 | 氯离子质量浓度/(mg·L–1) |
|---|
| |
| 1.35 | 0.174 | 1.09 |
| 1.09 | 0.169 | 1.06 |
| 0.86 | 0.174 | 1.09 |
| 0.64 | 0.157 | 0.98 |
| 0.50 | 0.157 | 0.98 |
), ArticleFig(id=1295064925353828559, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=表3, caption=
不同pH值下氯离子723C分光光度计测定结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| pH值 | As-A0 | 氯离子质量浓度/(mg·L–1) |
|---|
| |
| 1.35 | 0.174 | 1.09 |
| 1.09 | 0.169 | 1.06 |
| 0.86 | 0.174 | 1.09 |
| 0.64 | 0.157 | 0.98 |
| 0.50 | 0.157 | 0.98 |
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The detection data of detection limit
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| Ax | Ax-A0 | 溶液直接测量氯离子质量浓度/(mg·L–1) |
|---|
| 0.035 | 0.030 | 0.058 |
| 0.028 | 0.023 | 0.044 |
| 0.028 | 0.023 | 0.044 |
| 0.031 | 0.026 | 0.050 |
| 0.028 | 0.023 | 0.044 |
| 0.030 | 0.025 | 0.048 |
| 0.031 | 0.026 | 0.050 |
| 0.031 | 0.026 | 0.050 |
| 0.029 | 0.024 | 0.046 |
| 0.030 | 0.025 | 0.048 |
| 0.028 | 0.023 | 0.044 |
| 0.033 | 0.028 | 0.054 |
| 0.030 | 0.025 | 0.048 |
| 0.030 | 0.025 | 0.048 |
| 0.028 | 0.023 | 0.044 |
| 0.028 | 0.023 | 0.044 |
| 0.031 | 0.026 | 0.050 |
| 0.028 | 0.023 | 0.044 |
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检出限检测数据
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| Ax | Ax-A0 | 溶液直接测量氯离子质量浓度/(mg·L–1) |
|---|
| 0.035 | 0.030 | 0.058 |
| 0.028 | 0.023 | 0.044 |
| 0.028 | 0.023 | 0.044 |
| 0.031 | 0.026 | 0.050 |
| 0.028 | 0.023 | 0.044 |
| 0.030 | 0.025 | 0.048 |
| 0.031 | 0.026 | 0.050 |
| 0.031 | 0.026 | 0.050 |
| 0.029 | 0.024 | 0.046 |
| 0.030 | 0.025 | 0.048 |
| 0.028 | 0.023 | 0.044 |
| 0.033 | 0.028 | 0.054 |
| 0.030 | 0.025 | 0.048 |
| 0.030 | 0.025 | 0.048 |
| 0.028 | 0.023 | 0.044 |
| 0.028 | 0.023 | 0.044 |
| 0.031 | 0.026 | 0.050 |
| 0.028 | 0.023 | 0.044 |
), ArticleFig(id=1295064925567738066, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Tab.5, caption=
Test results of recovery rate
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| 编号 | 试样中氯离子质量浓度/(mg·L–1) | 加标氯离子质量浓度/(mg·L–1) | 溶液直接测量质量浓度/(mg·L–1) | 回收率/% |
|---|
| 1 | 0.010 1 | 0.250 0 | 0.227 1 | 86.80 |
| 2 | 0.010 1 | 0.250 0 | 0.245 9 | 94.33 |
| 3 | 0.010 1 | 0.250 0 | 0.245 9 | 94.33 |
| 4 | 0.010 1 | 0.250 0 | 0.264 8 | 101.86 |
| 5 | 0.010 1 | 0.250 0 | 0.239 7 | 91.82 |
| 6 | 0.010 1 | 0.250 0 | 0.275 5 | 106.15 |
| 7 | 0.010 1 | 0.250 0 | 0.283 5 | 109.37 |
| 8 | 0.010 1 | 0.250 0 | 0.281 5 | 108.57 |
| 9 | 0.010 1 | 0.250 0 | 0.285 5 | 110.18 |
| 10 | 0.010 1 | 0.250 0 | 0.275 5 | 106.15 |
), ArticleFig(id=1295064925651624147, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=表5, caption=
回收率实验结果
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| 编号 | 试样中氯离子质量浓度/(mg·L–1) | 加标氯离子质量浓度/(mg·L–1) | 溶液直接测量质量浓度/(mg·L–1) | 回收率/% |
|---|
| 1 | 0.010 1 | 0.250 0 | 0.227 1 | 86.80 |
| 2 | 0.010 1 | 0.250 0 | 0.245 9 | 94.33 |
| 3 | 0.010 1 | 0.250 0 | 0.245 9 | 94.33 |
| 4 | 0.010 1 | 0.250 0 | 0.264 8 | 101.86 |
| 5 | 0.010 1 | 0.250 0 | 0.239 7 | 91.82 |
| 6 | 0.010 1 | 0.250 0 | 0.275 5 | 106.15 |
| 7 | 0.010 1 | 0.250 0 | 0.283 5 | 109.37 |
| 8 | 0.010 1 | 0.250 0 | 0.281 5 | 108.57 |
| 9 | 0.010 1 | 0.250 0 | 0.285 5 | 110.18 |
| 10 | 0.010 1 | 0.250 0 | 0.275 5 | 106.15 |
), ArticleFig(id=1295064925722927316, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=EN, label=Tab.6, caption=
Determination results of mass concentrations of chloride ions in urea hydrolyzer samples
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| 水样编号 | 稀释倍数 | 分光光度法中氯离子质量浓度/(mg·L–1) | 离子色谱法中氯离子质量浓度/(mg·L–1) | 相对误差/% |
|---|
| 1 | 100 | 66.85 | 68.02 | –1.72 |
| 2 | 100 | 78.12 | 72.31 | 8.03 |
| 3 | 382.5 | 725.31 | 746.33 | –2.82 |
| 4 | 500 | 772.72 | 816.60 | –8.06 |
| 5 | 1 000 | 2 729.35 | 2 912.70 | –5.43 |
| 6 | 10 000 | 7 311.00 | 7 847.30 | 6.83 |
), ArticleFig(id=1295064925802619093, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1295064915576905838, language=CN, label=表6, caption=
尿素水解器样品中氯离子质量浓度测定结果
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| 水样编号 | 稀释倍数 | 分光光度法中氯离子质量浓度/(mg·L–1) | 离子色谱法中氯离子质量浓度/(mg·L–1) | 相对误差/% |
|---|
| 1 | 100 | 66.85 | 68.02 | –1.72 |
| 2 | 100 | 78.12 | 72.31 | 8.03 |
| 3 | 382.5 | 725.31 | 746.33 | –2.82 |
| 4 | 500 | 772.72 | 816.60 | –8.06 |
| 5 | 1 000 | 2 729.35 | 2 912.70 | –5.43 |
| 6 | 10 000 | 7 311.00 | 7 847.30 | 6.83 |
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