ICS 65.080  
 
Reference number
DRS 192: 2020
© RSB 2020
  
 RWANDA 
STANDARD  DRS
192
Second edition
2020 -mm-dd
Monoammonium phosphate (MAP) and 
diammonium phosphate (DAP) — 
Specification  
 
   
DRS 192: 2020  
©RSB 2020  - All rights reserved                  ii 
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB 2020  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without  
prior written permission from R SB. 
Requests for permission to reprodu ce this document should be addressed to : 
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Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw     DRS 192: 2020  
iii                ©RSB 2020  - All rights reserved  
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ................ 1 
2 Normative references  ................................ ................................ ................................ ....................... 1 
3 Terms and defi nitions  ................................ ................................ ................................ ...................... 1 
4 Requirements  ................................ ................................ ................................ ................................ ...2 
4.1 General requirements ................................ ................................ ................................ ....................... 2 
4.2 Specific requirements  ................................ ................................ ................................ ...................... 2 
5 Packaging and labelling  ................................ ................................ ................................ ................... 3 
5.1 Packaging  ................................ ................................ ................................ ................................ ......... 3 
5.2 Labelling  ................................ ................................ ................................ ................................ ........... 3 
6 Sampling  ................................ ................................ ................................ ................................ ........... 3 
 DRS 192: 2020  
©RSB 2020  - All rights reserved                  iv 
 Foreword   
Rwanda Standard s are prepared  by Technical Committees and approved by Rwanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adop ted by Technical committ ees are ratified  by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS 192 was prepared by Technical Committee RSB/TC 007, Agrochemicals  
In the preparation of this standard, reference was made to the following standard:  
FDARS 1485: Monommonium phosphate (MAP) and diammonium phosphate (DAP) fertilizers — 
Specification  
The assistance de rived from the above source is hereby acknowledged with thanks.  
Committee membership  
The following organizations were represented on the Technical Committee on Agrochemicals  (RSB/TC 007) in 
the preparation of this standard.  
One Acre Fund - TUBURA  
Ministry of Environment (MoE)  
University of Rwanda/College of Agriculture and Veterinary Medicine (UR/CAVM)  
University of Rwanda/College of Sciences and Technology (UR/CST)  
Rwanda Inspectorate, Competition and Consumer Protection Authority (RICA)  
Star Construction and Consultancy (SCC) Ltd  
Rwanda  Standards Board  (RSB) – Secretariat  
  DRS 192: 2020  
1                ©RSB 2020  - All rights reserved  
 Monoammonium phosphate (MAP) and Diammonium phosphate (DAP) 
fertilizers — Specification  
1 Scope   
This Draft Rwanda Standard specifies the requirements , sampling and test methods for monoammonium 
phosphate (MAP) and diammonium phosphate (DAP) fertilizers.  
2 Normative references  
The following documents are referred to in the text in such a way that some or all of  their content constitutes 
requirements of th is document.  For dated references, only the edition  cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
AOAC 2006.03 , Arsenic, cadmium, cobalt, chromium, lead, molybdenum, nickel, and selenium in fertilizers  — 
Microwave digestion and inductively coupled plasma -optical emission spectrometry  
EN 12048, Solid fertilizers and liming materials — Determination of moisture content — Gravimetric method 
by drying at 105 2 C 
EN 14888, Fertilizers  and liming materials — Determination of cadmium content  
ISO 5315, Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation  
ISO 5316, Fertilizers — Extraction of water -soluble phosphates  
ISO 6598, Fertilizers — Determination of phosphorus content — Quinoline phosphomolybdate gravimetric 
method  
ISO 8157, Fertilizers and soil conditioners — Vocabulary  
ISO 8633 , Solid fertilizers — Simple sampling method for small lots  
ISO 8634 , Solid fertilizers — Sampling plan for  the evaluation of a large delivery  
ISO 17318, Fertilizers and soil conditioners — Determination of arsenic, cadmium, chromium, lead and 
mercury contents  
3 Terms and definitions   
For the purposes of this standard, the terms and definitions given in ISO 8157  apply.  
  
©RSB 2020  - All rights reserved                  2 
 4 Requirements  
4.1 General requirements  
4.1.1  The fertilizer shall be made of water soluble  Monoammonium Hydrogen Phosphate [(NH 4)H2PO 4] or 
Diammonium Hydrogen Phosphate [(NH 4) 2HPO 4]. 
4.1.2  The fertilizer shall be free flowing, granular and free from any foreign matter.  
4.1.3  The fertilizer shall not be caked.  
4.1.4 When test sieved in accordance with ISO 8397 , not less than 90% of the material shall pass through 
4 mm sieve and be retained on 1 mm sieve. Not more than 5% shall be below 1 mm size . 
4.2 Specific requirements  
4.2.1  The fertilizer  shall comply with the requirements given in Table 1 when tested against the methods 
described.  
Table 1 — Chemical requirement s of m onoammonium phosphate (MAP) and diammonium phosphate 
(DAP) fertilizers  
Sl. 
No. Characteristic  Requirement % by mass  
Test method  
MAP  DAP 
i) Total nitrogen, min.  11 18 ISO 5315  
ii) Water soluble phosphates as P 2O5, min.  44 41 ISO 5316  
iii) Available phosphates, as P 2O5, min.  50 46 ISO 6598  
iv) Moisture, max.  1.5 1.5 EN 12048  
4.2.2 The fertilizer shall be free form harmful substance and free from level of radioactivity that is harmful 
to human life. Heavy metals shall not form part of the composition of the fertilizer; if present as contaminants, 
heavy metals shall not exceed t he maximum limits given in Table 2.  
Table 2 — Heavy metal contaminant limits of MAP and DAP fertilizer  
S/N Parameter  Limits, mg/kg  Test method  
i) Arsenic, As, max . 40 AOAC 2006.03 / ISO 17318  
ii) Cadmium, Cd, max.  30 AOAC 2006.03 / ISO 17318  
iii) Mercury,  Hg, max.  0.1 AOAC 2006.03 / ISO 17318  
iv) Selenium, Se, max.  1.0 AOAC 2006.03  
v) Lead, Pb, max.  80.0 AOAC 2006.03 / ISO 17318  
vi) Nickel  120 AOAC 2006.03 / ISO 17318  
vii) Chromium, Cr Max.  500 AOAC 2006.03 / ISO 17318  DRS 192: 2020  
3                ©RSB 2020  - All rights reserved  
 5 Packaging and labelling  
5.1 Packaging  
The fertiliser shall be packed in clean, non -defective and strong packages . The material for which the package  
is made shall be such as to protect the contents from moisture and also not lead to easy rupture dur ing 
handling, transportation and storage.  
5.2 Labelling  
5.2.1  Each package of the fertiliser shall be legibly and indelibly marked in accordance with ISO 7409 and 
the following particulars:  
a) name and physical address of manufacturer/packer/importer;  
b) name of the fertilizer, namely MAP or DAP fertilizer;  
c) guaranteed percentages of nutrient element nitrogen and available phosphates, i.e., N – P2O5 – K2O; 
d) date of manufacture ;  
e) expiry date or best before date;  
f) the net weight of the fertilizer in the package;  
g) lot number or batch number;  
h) handling and storage ins tructions;  
i) Country of origin.  
5.2.2  Where the product is distributed in bulk, the marking  information shall acco mpany the delivery notice 
to the purchaser.  
6 Sampling  
Sampling of the bagged fertilizers or the fertilizer in bulk shall be carried out in accord ance with ISO 14820 
(Parts 1 and 2).  
 
 
   
©RSB 2020  - All rights reserved                  4 
  DRS 192: 2020  
5                ©RSB 2020  - All rights reserved  
 Bibliography  
[1] ISO/IEC Directives, Part  2, Rules for the structure and drafting of International Standards , 2016  
 DRS 192: 2020  
 
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