Tiêu chuẩn quốc tế
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Số hiệu
Standard Number
ASTM D7600-16(2017)
Năm ban hành 2017
Publication date
Tình trạng
A - Còn hiệu lực
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Tên tiếng Anh
Title in English Standard Test Method for Determination of Aldicarb, Carbofuran, Oxamyl and Methomyl by Liquid Chromatography/Tandem Mass Spectrometry
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Chỉ số phân loại Quốc tế (ICS)
By field |
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Số trang
Page 10
Giá:
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Phạm vi áp dụng
Scope of standard 1.1 This procedure covers the determination of aldicarb, carbofuran, oxamyl and methomyl (referred to collectively as carbamates in this test method) in surface water by direct injection using liquid chromatography (LC) and detected with tandem mass spectrometry (MS/MS). These analytes are qualitatively and quantitatively determined by this test method. This test method adheres to multiple reaction monitoring (MRM) mass spectrometry. 1.2 This test method has been developed by U.S. EPA Region 5 Chicago Regional Laboratory (CRL). 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 The Detection Verification Level (DVL) and Reporting Range for the carbamates are listed in Table 1. Analyte DVL (ng/L) Reporting Range (μg/L) Aldicarb 100 1-100 Carbofuran 100 1-100 Oxamyl 100 1-100 Methomyl 100 1-100 1.4.1 The DVL is required to be at a concentration at least 3 times below the Reporting Limit (RL) and have a signal/noise ratio greater than 3:1. Fig. 1 displays the signal/noise ratios of the primary single reaction monitoring (SRM) transitions and Fig. 2 displays the confirmatory SRM transitions at the DVLs for the carbamates. FIG. 1 Example Primary SRM Chromatograms Signal/Noise Ratios FIG. 2 Example Confirmatory SRM Chromatograms Signal/Noise Ratios 1.4.2 The reporting limit is the concentration of the Level 1 calibration standard as shown in Table 2 for the carbamates. Analyte/Surrogate LV 1 LV 2 LV 3 LV 4 LV 5 LV 6 Aldicarb 1 5 10 25 50 100 Carbofuran 1 5 10 25 50 100 Oxamyl 1 5 10 25 50 100 Methomyl 1 5 10 25 50 100 BDMC (Surrogate) 2 10 20 50 100 200
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