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目的 评定液相色谱质谱/质谱联用仪法测定涉水产品中三聚氰胺的不确定度。方法 将样品涂在玻璃片上,在(25±5)℃避光封闭条件下浸泡于试验液中,并于第1、3、5、10、20、30天收集浸泡液,经过0.22 µm 滤膜后,经氨基色谱柱分离,以甲酸乙腈为流动相,进入质谱端分析,同时做作空白对照试验。依据《化学分析中测量不确定度评估指南》(RB/T030—2020)和《测量不确定度评定和表示》(GB/T 274182017)评估检测过程中所产生的不确定度,包括质谱稳定性、配制标准品、测量重复性、浸泡液体积和浸泡面积,并对各个因素引入的不确定度进行计算,取95%置信区间,扩展因子为2,得到扩展不确定度。结果 当涉水产品中三聚氰胺检测结果为4.9811 µg/mL 时, 扩展不确定度为0.0064%。结论 影响不确定度的主要因数是标准品、测量重复性、浸泡液体积和浸泡面积。
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| 定性离子对 | 定量离子对 | 锥孔电压 | 碰撞能量 |
| ${126.9} > {84.7}$ | ${126.9} > {84.7}$ | ${30}\mathrm{\;V}$ | 15 eV |
| ${126.9} > {67.7}$ | ${22}\mathrm{{eV}}$ |
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| 定性离子对 | 定量离子对 | 锥孔电压 | 碰撞能量 |
| ${126.9} > {84.7}$ | ${126.9} > {84.7}$ | ${30}\mathrm{\;V}$ | 15 eV |
| ${126.9} > {67.7}$ | ${22}\mathrm{{eV}}$ |
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| 分布 | 正态分布 | 梯形分布 | 三角分布 | 均匀分布 | 两点分布 | 反正弦分布 |
| $K$ | 2 | 2 | $\sqrt{6}$ | $\sqrt{3}$ | 1 | $\sqrt{2}$ |
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| 分布 | 正态分布 | 梯形分布 | 三角分布 | 均匀分布 | 两点分布 | 反正弦分布 |
| $K$ | 2 | 2 | $\sqrt{6}$ | $\sqrt{3}$ | 1 | $\sqrt{2}$ |
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| 相对丰度 | 允许偏差 /% |
| $> {50}$ | $\pm {20}$ |
| 20~50 | $\pm {25}$ |
| 10~20 | $\pm {30}$ |
| $\leq {10}$ | $\pm {50}$ |
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定性离子允许偏差范围, figureFileSmall=null, figureFileBig=null, tableContent=
| 相对丰度 | 允许偏差 /% |
| $> {50}$ | $\pm {20}$ |
| 20~50 | $\pm {25}$ |
| 10~20 | $\pm {30}$ |
| $\leq {10}$ | $\pm {50}$ |
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