ISO 6650:2023

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

This document specifies the analytical method for the simultaneous determination of N-(n-butyl) thiophosphoric triamide (NBPT) and dicyandiamide (DCD) in fertilizers by high-performance liquid chromatography (HPLC) method.

Engrais, Amendements et Substances Bénéfiques — Détermination Simultanée du N-buthylthiophosphore Triamide (NBPT) et du Dicyandiamide (DCD) par Chromatographie Liquide à Haute Performance (HPLC)

General Information

• Status: Published
• Publication Date: 17-Oct-2023
• ICS: 65.080 - Fertilizers
• Technical Committee: ISO/TC 134 - Fertilizers, soil conditioners and beneficial substances
• Drafting Committee: ISO/TC 134 - Fertilizers, soil conditioners and beneficial substances
• Current Stage: 6060 - International Standard published
• Start Date: 18-Oct-2023
• Due Date: 27-Mar-2024
• Completion Date: 18-Oct-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6650
First edition
2023-10
Fertilizers, soil conditioners and
beneficial substances — Simultaneous
determination of N-(n-Butyl)
thiophosphoric triamide and
dicyandiamide by high-performance
liquid chromatography
Engrais, Amendements et Substances Bénéfiques — Détermination
Simultanée du N-buthylthiophosphore Triamide (NBPT) et du
Dicyandiamide (DCD) par Chromatographie Liquide à Haute
Performance (HPLC)
Reference number
ISO 6650:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 6650:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 6650:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus and materials .2
7 Test procedure .3
7.1 General . 3
7.2 Preparation of test sample . 3
7.3 Preparation of the test solution . 3
7.4 HPLC conditions . 3
7.5 Determination of standard working solutions and sample test solutions . 4
7.5.1 Determination of standard working solutions . 4
7.5.2 Determination of sample test solutions . 4
8 Calculation and expression of results . 4
8.1 General . 4
8.2 Precision . .
...