Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D7979-17
• Năm ban hành / Publication date: 2017
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Method for Determination of Per- and Polyfluoroalkyl Substances in Water, Sludge, Influent, Effluent and Wastewater by Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS)
• Chỉ số phân loại Quốc tế (ICS) / By field: 13.060 - Chất lượng nước; 13.060.50 - Nghiên cứu chất hoá học trong nước; 71.080 - Hóa chất hữu cơ; 71.080.20 - Hiđrocacbon halogen hóa
• Số trang / Page: 27
• Phạm vi áp dụng / Scope of standard: 1.1 This procedure covers the determination of selected per- and polyfluoroalkyl substances (PFASs) in a water matrix using liquid chromatography (LC) and detection with tandem mass spectrometry (MS/MS). These analytes are qualitatively and quantitatively determined by this method. This method adheres to a technique known as selected reaction monitoring (SRM) or sometimes referred to as multiple reaction monitoring (MRM). This is not a drinking water method, performance of this test method has not been evaluated on drinking water matrices. 1.2 The Method Detection Limit (MDL)2 and Reporting Range3 for the target analytes are listed in Table 1. The target concentration for the reporting limit for this test method was 10 ng/L for most of the target analytes at the time of development. AnalyteA MDL (ng/L) Reporting Ranges (ng/L) PFTreAB 1.2 10 - 400 PFTriAB 0.7 10 - 400 PFDoAB 1.2 10 - 400 PFUnAB 1.2 10 - 400 PFDAB 1.4 10 - 400 PFOSB 2.2 10 - 400 PFNAB 1.1 10 - 400 PFecHSB 1.9 10 - 400 PFOAB 1.7 10 - 400 PFHxSB 1.2 10 - 400 PFHpAB 1.0 10 - 400 PFHxAB 2.0 10 - 400 PFBSB 0.8 10 - 400 PFPeAB 4.6 50 - 2000 PFBAB 4.6 50 - 2000 FHEA 92.9 300 - 8000 FOEA 106.8 300 - 8000 FDEA 47.2 200 - 8000 FOUEA 2.3 10 - 400 FHpPA 3.3 10 - 400 FHUEA 1.5 10 - 400(A) Acronyms are defined in 3.3.(B) New MDL study was reported in August 2016, which resulted in a reporting limit and range update. 1.2.1 The reporting limit in this test method is the minimum value below which data are documented as non-detects. The reporting limit may be lowered providing your lab meets the minimum performance requirements of this test method at the lower concentrations, this method is performance based and modifications are allowed to improve performance. Analyte detections between the method detection limit and the reporting limit are estimated concentrations and are not reported following this test method. In most cases, the reporting limit is the concentration of the Level 1 calibration standard as shown in Table 4 for the PFASs after taking into account the 50 % dilution with methanol. It is above the Level 1 calibration concentration for FHEA and FOEA, these compounds can be identified at the Level 1 concentration but the standard deviation among replicates at this lower spike level resulted in a higher reporting limit.