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Foreword 0 Introduction 0 1 Scope 0 2 Normative references 0 3 Terms and definitions 0 4 Principle 0 5 Interferences 0 5.1 Interferences with sampling, sample storage and sample preparation 0 5.2 Interferences with GC-MS 0 6 Reagents and standards 0 7 Apparatus and materials 0 8 Sample collection, preservation and storage 0 9 Procedure 0 9.1 Sample preparation 0 9.1.1 pH-adjustment of water sample 0 9.1.2 Phenylation and solvent extraction 0 9.1.3 Dehydration of toluene extract 0 9.2 Preparation of samples for GC‐MS 0 9.3 Optimization of operating condition for GC‐MS 0 9.4 Identification of individual substances with GC‐MS 0 9.5 Blank tests 0 10 Calibration 0 10.1 General requirements 0 10.2 Performance test of GC‐MS 0 10.3 Calibration with internal standard 0 10.3.1 General requirement 0 10.3.2 Procedure of calibration 0 10.4 Spike recovery test of target substances 0 11 Calculation 0 11.1 Calculation of results after calibration with internal standards 0 11.2 Treatment of results lying outside the calibration range 0 11.3 Quality checks for internal standardization 0 12 Expression of results 0 13 Test report 0 Annex A (informative) Example of operating condition of GC-MS 0 Annex

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ИСО

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reference