HJ 639-2012
Water quality-Determination of volatile organic compounds- Purge and trap/gas chromatography-mass spectrometer
水质 挥发性有机物的测定 吹扫捕集/气相色谱-质谱法
Catalogue
前言 → 1 适用范围 → 2 规范性引用文件 → 3 术语和定义 → 4 方法原理 → 5 试剂和材料 → 6 仪器和设备 → 7 样品 → 8 分析步骤 → 9 结果计算与表示 → 10 精密度和准确度 → 11 质量保证和质量控制 → 附录A（规范性附录）目标化合物的定量离子、辅助离子、方法检出限和测定下限 → 附录B（资料性附录）目标化合物的总离子流色谱图 → 附录C（资料性附录）方法精密度和准确度 Foreword → 1 Scope → 2 Normative References → 3 Terms and Definitions → 4 Principle of Method → 5 Reagents and Materials → 6 Instruments and Equipment → 7 Sample → 8 Analysis Procedure → 9 Calculation and Expression of Results → 10 Precision and Accuracy → 11 Quality Assurance and Quality Control → Annex A (Normative) Quantitative Ions, Auxiliary Ions, Method Detection Limits and Determination Limits of Target Compounds → Annex B (Informative) Total Ion Chromatogram of Target Compounds → Annex C (Informative) Method Precision and Accuracy
Scope
This standard specifies the purge and trap/gas chromatography-mass spectrometry method for the determination of volatile organic compounds in water. This standard is applicable to the determination of 57 volatile organic compounds in seawater, groundwater, surface water, domestic sewage and industrial wastewater. If validated, this standard may also be applicable to the determination of other volatile organic compounds. When the sample volume is 5 ml, using full scan mode, the method detection limits of target compounds are 0.6～5.0 µg/L, and the determination limits are 2.4～20.0 µg/L; using selected ion monitoring mode, the method detection limits of target compounds are 0.2～2.3 µg/L, and the determination limits are 0.8～9.2 µg/L. See Annex A for details.
本标准规定了测定水中挥发性有机物的吹扫捕集/气相色谱-质谱法。本标准适用于海水、地下水、地表水、生活污水和工业废水中57种挥发性有机物的测定。若通过验证，本标准也可适用于其他挥发性有机物的测定。当样品量为5ml时，用全扫描方式测定，目标化合物的方法检出限为0.6～5.0µg/L，测定下限为2.4～20.0µg/L；用选择离子方式测定，目标化合物的方法检出限为0.2～2.3µg/L，测定下限为0.8～9.2µg/L。详见附录A。
Normative References
Keywords
Application Summary AI generated
Analysts in environmental monitoring laboratories use this standard to determine volatile organic compounds in various water bodies. They employ purge and trap combined with gas chromatography-mass spectrometry to qualitatively and quantitatively analyze 57 target compounds in seawater, groundwater, surface water, domestic sewage, and industrial wastewater. This standard provides a unified method ensuring data comparability across different laboratories, which is crucial for water quality monitoring and pollution control.
环境监测实验室的分析人员使用本标准来测定各类水体中的挥发性有机物。他们通过吹扫捕集和气相色谱-质谱联用技术，对海水、地下水、地表水、生活污水和工业废水中的57种目标化合物进行定性和定量分析。该标准提供了统一的方法，确保不同实验室之间数据的可比性，对于水质监测和污染控制具有重要意义。
AI Summary AI generated
This standard specifies the purge and trap/gas chromatography-mass spectrometry method for determining volatile organic compounds in water, applicable to 57 compounds in seawater, groundwater, surface water, domestic sewage, and industrial wastewater. The principle involves purging the sample with high-purity helium, adsorbing VOCs onto a trap, thermal desorption, GC separation, and MS detection. Full scan mode detection limits range from 0.6 to 5.0 µg/L, while selected ion monitoring mode ranges from 0.2 to 2.3 µg/L. The standard details reagents, materials, instruments, sample collection and preservation, analytical procedures, result calculation, precision and accuracy, and quality control requirements including calibration curves, internal standards, and surrogate recovery.
本标准规定了吹扫捕集/气相色谱-质谱法测定水中挥发性有机物的方法，适用于海水、地下水、地表水、生活污水和工业废水中57种挥发性有机物的测定。方法原理为用高纯氦气吹扫样品，挥发性有机物吸附于捕集管，加热脱附后经气相色谱分离，质谱检测。全扫描方式检出限0.6-5.0µg/L，选择离子方式检出限0.2-2.3µg/L。标准详细规定了试剂材料、仪器设备、样品采集保存、分析步骤、结果计算、精密度准确度及质量控制要求，包括校准曲线、内标、替代物回收率等关键质控措施。
Key Sentences extracted from text
本标准规定了测定水中挥发性有机物的吹扫捕集/气相色谱-质谱法。
样品中的挥发性有机物经高纯氦气（或氮气）吹扫后吸附于捕集管中，将捕集管加热并以高纯氦气反吹，被热脱附出来的组分经气相色谱分离后，用质谱仪进行检测。
当样品量为5ml时，用全扫描方式测定，目标化合物的方法检出限为0.6～5.0µg/L，测定下限为2.4～20.0µg/L；用选择离子方式测定，目标化合物的方法检出限为0.2～2.3µg/L，测定下限为0.8～9.2µg/L。
校准曲线至少需5个浓度系列，目标化合物相对响应因子的RSD应小于等于20%，或者校准曲线相关系数大于等于0.990。
所有样品和空白中都需加入替代物，按与样品相同的步骤分析，每种替代物的回收率应在70%～130%以内。
This standard specifies the purge and trap/gas chromatography-mass spectrometry method for the determination of volatile organic compounds in water.
The volatile organic compounds in the sample are purged by high-purity helium (or nitrogen) and then adsorbed onto a trap tube; the trap tube is heated and backflushed with high-purity helium, and the thermally desorbed components are separated by gas chromatography and detected by mass spectrometer.
When the sample volume is 5 ml, using full scan mode, the method detection limits of target compounds are 0.6～5.0 µg/L, and the determination limits are 2.4～20.0 µg/L; using selected ion monitoring mode, the method detection limits of target compounds are 0.2～2.3 µg/L, and the determination limits are 0.8～9.2 µg/L.
The calibration curve shall have at least 5 concentration levels, and the RSD of the relative response factors of target compounds shall be less than or equal to 20%, or the correlation coefficient of the calibration curve shall be greater than or equal to 0.990.
Surrogate standards shall be added to all samples and blanks, analyzed following the same procedure as samples, and the recovery of each surrogate shall be within 70% to 130%.