Determination of 15 Rare Earth Elements in Uranium Ore by Open Acid Dissolution-Inductively Coupled Plasma-Mass Spectrometry
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摘要:
研究铀矿石中的稀土元素特征可以判断其成矿流体物质来源、成岩构造环境和物化条件等,因此准确测定铀矿石中稀土元素的含量显得尤为重要。目前测定稀土元素主要采用电感耦合等离子体质谱法(ICP-MS),样品处理多采用封闭酸溶法,而敞开酸溶法应用不多,主要原因是敞开酸溶时常常加入高氯酸,溶样温度难以将稀土氟化物完全分解而造成测定结果偏低,但在溶样过程中引入硫酸,利用硫酸的高沸点则能完全分解稀土氟化物。基于此原理,本文采用硝酸-氢氟酸-高氯酸-硫酸四酸体系对铀矿石样品进行敞开酸溶,采用在线加入铑内标的方式,建立了ICP-MS法测定铀矿石中15种稀土元素的方法。结果表明:溶样时加入硫酸能完全溶解铀矿石样品,溶液澄清,15种稀土元素的相对标准偏差(RSD)在0.54%~5.98%之间,回收率在96.0%~106.0%之间。将本方法应用于分析岩石国家标准物质(GBW07103、GBW07104、GBW07122),其测定值与标准值一致,相对误差在-8.33%~7.24%之间,表明本方法测定稀土元素是可行的。
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关键词:
- 铀矿石 /
- 稀土元素 /
- 硝酸-氢氟酸-高氯酸-硫酸敞开酸溶 /
- 电感耦合等离子体质谱法
Abstract:BACKGROUND Studying the characteristics of rare earth elements in uranium ore can determine the source of the ore-forming fluids, the mineralization environment, and the physical and chemical conditions. It is particularly important to accurately determine the content of rare earth elements in uranium ore. At present, rare earth elements are mainly determined by inductively coupled plasma-mass spectrometry (ICP-MS). High-pressure closed acid-dissolution is commonly used. The open acid dissolution method is rarely used because perchloric acid is routinely used to dissolve samples, and the temperature is relatively low, which may cause incomplete decomposition of some samples.
OBJECTIVES In order to solve the problem that the rare earth elements have contents lower than real values in open acid dissolution.
METHODS The tetracid system of nitric acid-hydrofluoric acid-perchloric acid-sulfuric acid was used in the open acid dissolution method. ICP-MS with Rh as internal standard was used to determine 15 rare earth elements in uranium ore.
RESULTS The relative standard deviation (RSD) of the 15 rare earth elements was between 0.54% and 5.98%, and the recovery was between 96.0% and 106.0%. Applying to national rock standard materials (GBW07103, GBW07104, GBW07122), the measured values were consistent with the standard values, and the relative error (RE) was between -8.33% and 7.24%, indicating that this method was effective for the determination of rare earth elements.
CONCLUSIONS The method has simple operation, accurate and reliable results, and is suitable for the determination of rare earth elements in large quantities of uranium ore.
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表 1 两种样品前处理方法分析结果
Table 1. Analytical results of two sample pretreatment methods
稀土元素 GBW07103 GBW07104 标准值(μg/g) 方法一测定值(μg/g) 方法二测定值(μg/g) 标准值(μg/g) 方法一测定值(μg/g) 方法二测定值(μg/g) La 54±4 44.12 55.63 22±2 17.23 22.65 Ce 108±7 91.56 110.7 40±3 33.59 41.89 Pr 12.7±0.8 8.97 12.47 4.9±0.4 4.06 4.99 Nd 47±4 41.16 48.56 19±2 16.65 19.44 Sm 9.7±0.8 8.65 9.96 3.4±0.2 3.02 3.31 Eu 0.85±0.07 0.78 0.88 1.02±0.05 0.92 1.07 Gd 9.30±0.7 8.29 9.17 2.70±0.4 2.46 2.76 Tb 1.65±0.09 1.22 1.59 0.41±0.05 0.34 0.43 Dy 10.2±0.4 8.94 10.31 1.85±0.17 1.61 1.91 Ho 2.05±0.17 1.77 2.09 0.34±0.03 0.25 0.35 Er 6.5±0.3 6.18 6.37 0.85±0.13 0.76 0.88 Tm 1.06±0.09 0.91 1.02 0.15±0.05 0.12 0.14 Yb 7.4±0.5 6.89 7.27 0.89±0.13 0.81 0.93 Lu 1.15±0.09 1.03 1.18 0.12±0.03 0.10 0.13 Y 62±5 54.28 64.45 9.3±1.2 7.61 9.64 表 2 同位素及质谱干扰
Table 2. Isotope and mass spectrum interference
分析元素 同位素 质谱干扰基团 分析元素 同位素 质谱干扰基团 La 139 - Dy 163 - Ce 140 - Ho 165 - Pr 141 - Er 166 - Nd 146 130BaO Tm 169 - Sm 147 - Yb 172 - Eu 153 137BaO Lu 175 - Gd 157 140CeOH, 141PrO Y 89 - Tb 159 143NdO 注:表中“-”表示不存在质谱干扰。 表 3 岩石标准物质中稀土元素含量测定
Table 3. Determination of rare earth elements in rock reference materials
稀土元素 GBW07103(n=4) GBW07104(n=4) GBW07122(n=4) 标准值(μg/g) 测定均值(μg/g) 相对误差(%) 标准值(μg/g) 测定均值(μg/g) 相对误差(%) 标准值(μg/g) 测定均值(μg/g) 相对误差(%) La 54±4 55.82 3.37 22±2 21.92 -0.36 2.9±0.4 3.11 7.24 Ce 108±7 111.4 3.15 40±3 41.70 4.25 7.8±1.0 8.02 2.82 Pr 12.7±0.8 13.12 3.31 4.9±0.4 4.92 0.41 1.25±0.15 1.31 4.80 Nd 47±4 48.01 2.15 19±2 19.30 1.58 6.5±1.4 6.74 3.69 Sm 9.7±0.8 10.16 4.74 3.4±0.2 3.44 1.18 2.1±0.2 2.21 5.24 Eu 0.85±0.07 0.87 2.35 1.02±0.05 1.08 5.88 0.91±0.15 0.87 -4.40 Gd 9.30±0.7 9.19 -1.18 2.70±0.4 2.66 -1.48 2.8±0.3 2.72 -2.86 Tb 1.65±0.09 1.66 0.61 0.41±0.05 0.39 -4.88 0.57±0.08 0.56 -1.75 Dy 10.2±0.4 10.05 -1.47 1.85±0.17 1.79 -3.24 3.5±0.5 3.64 4.00 Ho 2.05±0.17 2.08 1.46 0.34±0.03 0.32 -5.88 0.85±0.14 0.84 -1.18 Er 6.5±0.3 6.53 0.46 0.85±0.13 0.87 2.35 2.3±0.4 2.41 4.78 Tm 1.06±0.09 1.09 2.83 0.15±0.05 0.14 -6.67 0.37±0.10 0.39 5.41 Yb 7.4±0.5 7.45 0.68 0.89±0.13 0.85 -4.49 2.4±0.4 2.45 2.08 Lu 1.15±0.09 1.17 1.74 0.12±0.03 0.11 -8.33 0.39±0.06 0.38 -2.56 Y 62±5 61.06 -1.52 9.3±1.2 9.12 -1.94 20±3 20.33 1.65 表 4 标准物质GBW04108加标回收试验
Table 4. Recovery tests of reference material GBW04108
稀土元素 原始值(μg/g) 加入量(μg/g) 加标后测定值(μg/g) 回收率(%) La 40.96 40.00 82.23 103.2 Ce 81.83 100.0 183.21 101.4 Pr 10.09 10.00 19.98 98.9 Nd 34.53 50.00 84.56 100.1 Sm 6.00 5.00 11.12 102.4 Eu 0.84 1.00 1.82 98.0 Gd 5.13 5.00 10.04 98.2 Tb 0.83 1.00 1.79 96.0 Dy 4.62 5.00 9.73 102.2 Ho 0.93 1.00 1.98 105.0 Er 2.82 5.00 7.69 97.4 Tm 0.43 0.50 0.96 106.0 Yb 2.88 2.00 4.95 103.5 Lu 0.45 0.50 0.96 102.0 Y 25.01 20.00 44.46 97.3 表 5 不同溶样方法比对实验结果
Table 5. Comparison of analytical results with different sample pretreatment methods
稀土元素 GBW04103 GBW04104 本文方法测定值(μg/g) 高压密闭酸溶测定值(μg/g) 本文方法测定值(μg/g) 高压密闭酸溶测定值(μg/g) La 31.30 31.52 6.11 6.18 Ce 69.87 69.97 13.88 13.96 Pr 9.19 9.18 1.89 1.85 Nd 37.44 37.35 7.65 7.57 Sm 11.11 11.19 1.73 1.69 Eu 0.67 0.68 0.36 0.35 Gd 13.71 13.66 1.89 1.84 Tb 2.51 2.49 0.29 0.30 Dy 16.88 16.96 1.65 1.62 Ho 3.65 3.69 0.34 0.35 Er 11.42 11.33 0.91 0.89 Tm 1.94 1.98 0.13 0.12 Yb 13.65 13.81 0.77 0.75 Lu 2.22 2.21 0.11 0.11 Y 107.2 108.8 10.41 10.35 -
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