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目的 建立一种安全、简便、准确的同时测定生活饮用水中砷、硒、汞含量的方法。方法 本文采用三通道原子荧光光度计测定砷、硒、汞含量,并与冷原子荧光法进行对比分析,通过探索点火测量汞元素及添加硫脲抗坏血酸对汞和硒的影响,验证同时测量砷、硒、汞元素的准确度、检出限、线性关系和精密度。结果 同一样品同时测定砷、硒、汞线性校准曲线相关系数均大于 0.999、检出限低于国标检出限、精密度均小于 5%、加标回收率在 98.2%~103.4%之间,有证标准物质均在合格范围内。结论 本文方法操作可行,方法准确、灵敏度高,有效地提高了生活饮用水检测效率。
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同时测定砷汞硒元素标准曲线及荧光值对比, figureFileSmall=hXAjqR0uPi4/LiBVkfwtfQ==, figureFileBig=4o+RNZnmiRupcrJiQ5vaPQ==, tableContent=null), ArticleFig(id=1154798432712773946, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1152987123717231520, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 元素 | 有证标准溶液质量浓度 | 测定值 | 相对误差 RE |
| 砷 | ${10.40} \pm {0.80}$ | 10.30 | 0.96% |
| 硒 | ${6.78} \pm {0.53}$ | 6.77 | 0.15% |
| 汞 | ${4.23} \pm {0.36}$ | 4.21 | 0.47% |
), ArticleFig(id=1154798432788271419, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1152987123717231520, language=CN, label=表 1, caption=
加入硫脲 - 抗坏血酸有证标准溶液测试数据, figureFileSmall=null, figureFileBig=null, tableContent=
| 元素 | 有证标准溶液质量浓度 | 测定值 | 相对误差 RE |
| 砷 | ${10.40} \pm {0.80}$ | 10.30 | 0.96% |
| 硒 | ${6.78} \pm {0.53}$ | 6.77 | 0.15% |
| 汞 | ${4.23} \pm {0.36}$ | 4.21 | 0.47% |
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| 元素 | 有证标准溶液质量浓度 | 测定值(μg/L) | 相对误差 RE |
| 砷 | ${10.40} \pm {0.80}$ | 7.74 | 25.58% |
| 硒 | ${6.78} \pm {0.53}$ | 6.02 | 11.2% |
| 汞 | ${4.23} \pm {0.36}$ | 4.33 | 2.36% |
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未加入硫脲抗坏血酸有证标准溶液测试数据, figureFileSmall=null, figureFileBig=null, tableContent=
| 元素 | 有证标准溶液质量浓度 | 测定值(μg/L) | 相对误差 RE |
| 砷 | ${10.40} \pm {0.80}$ | 7.74 | 25.58% |
| 硒 | ${6.78} \pm {0.53}$ | 6.02 | 11.2% |
| 汞 | ${4.23} \pm {0.36}$ | 4.33 | 2.36% |
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| 元素 | 标准曲线 | 相关系数 |
| 砷(As) | $y = {354.4739x} - {1.3890}$ | 0.9999 |
| 硒(Se) | $y = {88.0050x} + {27.2864}$ | 0.9997 |
| 汞(Hg) | $y = {1154.4980x} - {6.5566}$ | 0.9995 |
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同时测定砷、汞、硒元素的标准曲线及相关系数, figureFileSmall=null, figureFileBig=null, tableContent=
| 元素 | 标准曲线 | 相关系数 |
| 砷(As) | $y = {354.4739x} - {1.3890}$ | 0.9999 |
| 硒(Se) | $y = {88.0050x} + {27.2864}$ | 0.9997 |
| 汞(Hg) | $y = {1154.4980x} - {6.5566}$ | 0.9995 |
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| 元素 | 测定序号 | 平均值 | RSD |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 砷(μg/L) | 10.2964 | 10.3163 | 10.2215 | 10.2829 | 10.3518 | 10.2101 | 10.2209 | 10.2714 | 0.53% |
| 硒(μg/L) | 9.6482 | 9.6574 | 9.5258 | 9.6179 | 9.5794 | 9.5305 | 9.5458 | 9.5864 | 0.58% |
| 汞(μg/L) | 1.181 | 1.0706 | 1.0609 | 1.0945 | 1.1643 | 1.1155 | 1.1321 | 1.1170 | 4.10% |
), ArticleFig(id=1154798433237061957, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1152987123717231520, language=CN, label=表 4, caption=
精密度的测定, figureFileSmall=null, figureFileBig=null, tableContent=
| 元素 | 测定序号 | 平均值 | RSD |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 砷(μg/L) | 10.2964 | 10.3163 | 10.2215 | 10.2829 | 10.3518 | 10.2101 | 10.2209 | 10.2714 | 0.53% |
| 硒(μg/L) | 9.6482 | 9.6574 | 9.5258 | 9.6179 | 9.5794 | 9.5305 | 9.5458 | 9.5864 | 0.58% |
| 汞(μg/L) | 1.181 | 1.0706 | 1.0609 | 1.0945 | 1.1643 | 1.1155 | 1.1321 | 1.1170 | 4.10% |
), ArticleFig(id=1154798433320948040, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1152987123717231520, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 编号 | 本底值 (μg/L) | 加标量 (μg) | 加标测定 (μg/L) | 加标回收率 (%) |
| As | 1 | 2.0080 | 16.0 | 17.7244 | 98.2 |
| 2 | 8.0 | 10.0306 | 100.3 |
| 3 | 3.0 | 4.7978 | 93.0 |
| Se | 1 | 2.0010 | 16.0 | 18.2356 | 101.5 |
| 2 | 8.0 | 10.0250 | 100.3 |
| 3 | 3.0 | 5.1030 | 103.4 |
| $\mathrm{{Hg}}$ | 1 | 0.2242 | 0.2 | 0.4225 | 99.2 |
| 2 | 0.8 | 1.0658 | 105.2 |
| 3 | 1.4 | 1.6397 | 101.1 |
), ArticleFig(id=1154798433388056906, tenantId=1146029695717560320, journalId=1146119944283992078, articleId=1152987123717231520, language=CN, label=表 5, caption=
加标回收率的测定, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 编号 | 本底值 (μg/L) | 加标量 (μg) | 加标测定 (μg/L) | 加标回收率 (%) |
| As | 1 | 2.0080 | 16.0 | 17.7244 | 98.2 |
| 2 | 8.0 | 10.0306 | 100.3 |
| 3 | 3.0 | 4.7978 | 93.0 |
| Se | 1 | 2.0010 | 16.0 | 18.2356 | 101.5 |
| 2 | 8.0 | 10.0250 | 100.3 |
| 3 | 3.0 | 5.1030 | 103.4 |
| $\mathrm{{Hg}}$ | 1 | 0.2242 | 0.2 | 0.4225 | 99.2 |
| 2 | 0.8 | 1.0658 | 105.2 |
| 3 | 1.4 | 1.6397 | 101.1 |
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