丙二醇甲醚中超痕量金属杂质元素的ICP-MS/MS分析
Analysis of Ultra-Trace Metal Impurity Elements in Proprylene Glycol Monomethyl Ether Using Inductively Coupled Plasma Tandem Mass Spectrometry
湖南工学院新型建筑材料研究院, 湖南 衡阳 421002
图 & 表
图 1. NH3/He反应气流速的优化
(a): 原位质量法; (b): 质量转移法
Fig. 1. Optimization of the NH3/He reaction gas flow rate
(a): On-mass method; (b): Mass shift method
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表 1ICP-MS/MS的操作参数
Table1. ICP-MS/MS operating parameters
Parameter | Setting |
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RF power/W | 1 550 | Carrier gas flow/(L·min-1) | 1.05 | Make up gas flow/(L·min-1) | 0.25 | Sampling depth/mm | 8 | Cell gas | NH3/He/H2(10% NH3 in He) | Cell gas flow rate/(mL·min-1) | NH3/He: 2.8; H2=2.0 | ORS bias voltage/V | -18 | KED voltage/V | -8 |
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表 2在不同分析模式下分析元素的背景等效浓度(BEC)
Table2. Background equivalent concentrations (BEC) of analytes in different analysis modes
Isotope | Potential interferences | BEC/(ng·L-1) |
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SQ mode | MS/MS mode |
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no gas | He | NH3/He | NH3/He/H2 | 24Mg | 12C2, 23Na1H, 7Li17O, 48Ti++, 48Ca++ | 2 970 | 411 | 29.8 | 31.2 | 27Al | 12C15N, 12C14NH | 860 | 202 | 77.3 | 75.4 | 39K | 38ArH, 23Na16O | 189 000 | 65 300 | 126 | 84.3 | 48Ti | 32S16O, 34S14N, 33S15N, 14N16O18O, 36Ar12C | 1 560 | 87.4 | 21.0 | 16.7 | 51V | 35Cl16O, 36Ar14NH, 34Ar16OH, 36Ar13C, 36Ar15N | 479 | 15.3 | 8.16 | 5.04 | 52Cr | 40Ar12C, 35Cl16OH, 36Ar16O, 38Ar14N, 36Ar15N1H | 2 170 | 73.6 | 41.4 | 35.8 | 56Fe | 40Ar16O, 40Ca16O, 40Ar15N1H, 38Ar18O, 112Cd++ | 1 810 | 425 | 122 | 94.1 | 60Ni | 23Na36ArH, 23Na37Cl, 44Ca16O, 59CoH | 316 | 49.7 | 21.8 | 17.6 | 63Cu | 23Na40Ar, 23Na40Ca, 12C16O35Cl, 12C14N37Cl, 46Ca16OH | 177 | 51.3 | 40.5 | 34.4 | 66Zn | 34S16O2, 48Ti18O, 48Ca18O, 32S17O2, 33S17O16O, 32S34S | 223 | 148 | 116 | 89.5 |
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表 3不同模式下用于消除干扰实验的回收率
Table3. Recovery of interference removal experiment in different modes
Analyte | Interference | Recovery/% |
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Added interferent | Interfering ion | No gas mode | NH3/He/H2 reaction mode |
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24Mg | C (Ethanol) | 12 | 307 | 101.3 | 27Al | C (Ethanol) | 12C15N+, 12C14NH+ | 223 | 99.1 | 39K | / | 38ArH+ | 851 | 98.6 | 48Ti | S (S) | 32S16O+, 34S14N+ | 1 260 | 102.5 | 51V | Cl (Cl-) | 35Cl16O+ | 208 | 100.7 | 52Cr | C (Euhanol) | 40Ar12C+ | 715 | 101.6 | 56Fe | / | 40Ar16O+ | 1 070 | 97.5 | 60Ni | Na (Na+) | 23Na36ArH+ | 322 | 99.1 | 63Cu | Na (Na+) | 23Na40Ar+ | 450 | 103.4 | 66Zn | S (S) | 34S16, 32S17 | 279 | 98.9 |
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表 4校准数据与检出限
Table4. Calibration data and instrumental limits of detection (LOD)
Element | Linear range /(μg·L-1) | Coefficient (r) | LOD /(ng·L-1) | Element | Linear range /(μg·L-1) | Coefficient (r) | LOD /(ng·L-1) |
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Mg | 0~100 | 0.999 9 | 15.1 | Cr | 0~100 | 1.000 0 | 2.18 | Al | 0~100 | 1.000 0 | 17.2 | Fe | 0~100 | 0.999 8 | 35.3 | K | 0~100 | 0.999 8 | 61.5 | Ni | 0~100 | 1.000 0 | 9.75 | Ti | 0~100 | 0.999 7 | 3.84 | Cu | 0~100 | 0.999 9 | 5.81 | V | 0~100 | 1.000 0 | 0.52 | Zn | 0~100 | 0.999 8 | 40.6 |
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表 5方法的准确性和精密度(n=6)
Table5. The accuracy and precisions of method (n=6)
Element | Spiked /(μg·L-1) | Found by ICP-MS/MS /(μg·L-1) | RSD /% | Recovery /% | Found by SF-ICP-MS /(μg·L-1) | t test |
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Mg | 5.00 | 5.12±0.23 | 4.5 | 102.4 | 5.08±0.19 | p=0.37 | Al | 5.00 | 4.91±0.11 | 2.2 | 98.2 | 4.85±0.12 | p=0.15 | K | 5.00 | 4.88±0.10 | 2.0 | 97.6 | 4.94±0.15 | p=0.21 | Ti | 5.00 | 5.09±0.15 | 2.9 | 101.8 | 5.16±0.21 | p=0.26 | V | 5.00 | 5.17±0.19 | 3.7 | 103.4 | 5.05±0.24 | p=0.18 | Cr | 5.00 | 4.83±0.14 | 2.9 | 96.6 | 4.74±0.18 | p=0.11 | Fe | 5.00 | 5.21±0.20 | 3.8 | 104.2 | 5.13±0.16 | p=0.23 | Ni | 5.00 | 4.78±0.08 | 1.7 | 95.6 | 4.82±0.12 | p=0.26 | Cu | 5.00 | 4.81±0.21 | 4.4 | 96.2 | 4.85±0.09 | p=0.33 | Zn | 5.00 | 5.19±0.14 | 2.7 | 103.8 | 5.07±0.10 | p=0.06 |
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表 6PGME中10个超痕量金属元素的分析结果(ng·g-1, n=6)
Table6. Analytical results for determination of 10 ultra-trace metal elements in PGME (ng·g-1, n=6)
Element | Sample 1 | Sample 2 | Sample 3 |
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ICP-MS/MS | SF-ICP-MS | ICP-MS/MS | SF-ICP-MS | ICP-MS/MS | SF-ICP-MS |
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Mg | 2.56±0.03 | 2.34±0.04 | 1.87±0.03 | 1.92±0.02 | 2.15±0.04 | 2.20±0.05 | Al | 1.36±0.02 | 1.41±0.02 | 2.05±0.02 | 2.09±0.03 | 3.61±0.05 | 3.53±0.04 | K | 2.23±0.01 | 2.19±0.03 | 4.59±0.05 | 4.66±0.08 | 1.20±0.02 | 1.31±0.05 | Ti | 2.80±0.05 | 3.01±0.07 | 1.50±0/02 | 1.43±0.03 | 1.97±0.03 | 1.83±0.03 | V | 1.62±0.03 | 1.57±0.02 | 0.75±0.01 | 0.79±0.01 | 1.84±0.05 | 1.68±0.02 | Cr | 0.93±0.01 | 1.04±0.03 | 2.40±0.03 | 2.31±0.02 | 2.75±0.03 | 2.82±0.03 | Fe | 5.10±0.12 | 5.23±0.10 | 3.65±0.05 | 3.71±0.04 | 8.06±0.13 | 7.82±0.16 | Ni | 1.66±0.02 | 1.74±0.03 | 0.69±0.01 | 0.64±0.01 | 1.73±0.04 | 1.81±0.04 | Cu | 4.77±0.08 | 4.92±0.09 | 2.87±0.04 | 2.82±0.06 | 3.21±0.03 | 3.39±0.05 | Zn | 3.45±0.04 | 3.36±0.05 | 1.21±0.01 | 1.16±0.02 | 2.27±0.02 | 2.32±0.02 |
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李坦平, 李爱阳. 丙二醇甲醚中超痕量金属杂质元素的ICP-MS/MS分析[J]. 光谱学与光谱分析, 2021, 41(2): 618. Tan-ping LI, Ai-yang LI. Analysis of Ultra-Trace Metal Impurity Elements in Proprylene Glycol Monomethyl Ether Using Inductively Coupled Plasma Tandem Mass Spectrometry[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 618.