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BS ISO 6650:2023

BS ISO 6650:2023

$142.49

Fertilizers, soil conditioners and beneficial substances. Simultaneous determination of N-(n-Butyl) thiophosphoric triamide and dicyandiamide by high-performance liquid chromatography

Published By Publication Date Number of Pages
BSI 2023 30
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PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principle
5 Reagents
5.1 Acetonitrile (ACN), HPLC grade.
5.2 N-(n-butyl) thiophosphoric triamide (NBPT), assay, of a mass fraction ≥98 %.
5.3 Dicyandiamide (DCD) assay, of a mass fraction ≥99 %.
5.4 Stock solutions.
5.4.1 NBPT stock solution (1 000 mg/l).
5.4.2 DCD stock solution (1 000 mg/l).
5.5 Standard solutions.
6 Apparatus and materials
11 6.3 Ultrasonic bath.
7 Test procedure
7.1 General
7.2 Preparation of test sample
7.3 Preparation of the test solution
7.4 HPLC conditions
12 7.5 Determination of standard working solutions and sample test solutions
7.5.1 Determination of standard working solutions
7.5.2 Determination of sample test solutions
8 Calculation and expression of results
8.1 General
8.2 Precision
8.2.1 Ring test
8.2.2 Repeatability, r
13 8.2.3 Reproducibility, R
9 Test report
14 Annex A (normative) Typical HPLC chromatogram of DCD and NBPT
15 Annex B (informative) Interlaboratory test report ofthe International Laboratories Ring Test
28 Bibliography

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BS ISO 6650:2023
$142.49