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Microwave plasma torch（MPT）is a new type of plasma excitation source developed by domestic research team. It is a soft ionization technology with atmospheric ionization characteristics and is mostly used for the analysis of organic matter. Compared with inductively coupled plasma（ICP）ionization sources，MPT has low ionization energy and is difficult to ionize the tested elements into metal ions，which limits its application in inorganic detection. In order to broaden the application range of MPT source，linear ion trap mass spectrometry（LTQ-MS）was used to establish a quantitative analysis method for zirconium，which was applied to environmental monitoring. The zirconium solution was introduced into the MPT-LTQ-MS experimental device，and the aerosol was produced by pneumatic atomization. After drying by concentrated sulfuric acid，the dried aerosol formed anions in the plasma flame generated by the microwave plasma moment，and was detected by LTQ-MS in the negative ion mode. The experimental results show that part of the excited zirconium ion can basically be confirmed to exist in the form of [ZrO(NO3)3]-. This composite anion can be used as the characteristic signal to detect zirconium in water samples，and can be quantitatively analyzed by the characteristic spectral peak of multi-stage mass spectrometry. The characteristic signal of m/z 292 （90Zr）showed a good linear correlation with the concentration of zirconium in the concentration range of 5~100 μg·L-1(R2=0.998 8). The limit of detection (LOD) of the method was 2.6 μg·L-1，and the precision (RSD) was better than 8.9 %. The content of zirconia in surface water was determined by MPT-LTQ-MS，ranging from 0.34 to 3.22 μg·L-1，and the recovery of standard addition was 94 % to 105 %. The results show that MPT-LTQ-MS can be used as a simple method for the determination of zirconium，and can be used in environmental monitoring and drinking water testing.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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