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Foreword 0 Introduction 0 1 Scope 0 2 Normative references 0 3 Terms and definitions 0 4 Principles 0 5 Reagents 0 6 Apparatus 0 7 Procedures 0 7.1 Preparation of test sample 0 7.2 Preparation of the test solution 0 7.3 Preparation of urea working standard solution 0 7.4 HPLC conditions 0 7.5 Preparation of standard curve 0 7.6 Determination of the urea content in the test solution 0 7.7 Calculation and expression of results 0 7.8 Precision 0 7.8.1 Repeatability, r 0 7.8.2 Reproducibility, R 0 7.9 Test report 0 Annex A (informative) Examples of the retention times of triuret, biuret, urea and some other ureaforms 0 Bibliography 0

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ISO

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