KENYA STANDARD       KS 2426 :2018     
           
 
 
 
 
 
 
 
 
 
 
 
 Monopotassium phosphate ( technical  
grade ) fertilizer  — Specification  
 
 
 
 
 
 
 
 
        
 
 
 
 
 
 
  
 
            DRAFT STANDARD   AUGUST 2018                    SECOND     EDITION  
 
 
 
 
 
 
 
 KEBS 201 8          
 
ii  ©   TECHNICAL COMMITTEE REPRESENTATION  
 
The following organizations were represented on the Technical Committee:  
 
Government Chemist  
Mea Ltd.  
Chemagro Ltd  
Kenya Plant Health Inspectorate Services (KEPHIS)  
Kenya Agricultural   and livestock  research organization  
Yara East Africa Ltd  
Kenya Tea Development Agency  
University of Nairobi  
Ministry of Agriculture, Livestock and fisheries  
Amiran (K) Ltd  
Toyota Tshusho Fertilizers  
Elgon chemicals  
Osho chemicals  
OCP Kenya Ltd.  
Kel Chemicals  
Kenya Bure au of Standards — Secretariat  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REVISION OF KENYA STANDARDS  
 
In order to keep abreast of progress in industry, Kenya Standards shall be regularly reviewed. Suggestions 
for improvements to published standards, addressed to the Managing Directo r, Kenya Bureau of Standards, 
are welcome.  
 
 
 
 
 
© Kenya Bureau of standards, 201 8 
 
Copyright:  Users are reminded that by virtue of Section 6 of the Copyright Act, Cap. 130 of the Laws of Kenya, copyright subsists in all 
Kenya Standards and except as provi ded under Section 7 of this Act, no Kenya Standard may be reproduced, stored in a retrieval 
system in any form or transmitted by any means without prior permission in writing from the Managing Director.  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
iv  ©  KENYA STANDARD       KS 2426 :2018   
         . 
 
 
 
 
 
 
 
 
 
 
 
 
Monopotassium  phosphate  Fertilizer , 
technical grade  — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254 020) 605490, 602350, Fax: (+254 020) 604031  
E-Mail: info@kebs.org,  Web:http://www.kebs.org   
 
Coast Region     Lake Region          Rift Valley Region  
P.O. Box 99376, Mombasa -80100   P.O. Box 2949, Kisumu -40100        P.O. Box 2138, Nakuru -20100  
Tel.: (+254 041) 229563, 230939/40                Tel.: (+2 54 057) 23549, 22396        Tel.: (+254 051) 210553, 210555   
 Fax: (+254 041) 229448    Fax: (+254 057) 21814  
 
 
 
Foreword  
 
This Kenya standard has been prepared by the technical committee on fertilizers and soil 
conditioners under the guidance of the standards  projects committee in accordance with 
the procedures of the Kenya Bureau of standards.  
 
 
The rapid expansion of horticulture and irrigated farming  has resulted in development of 
new technologies that aim at maximising nutrient use efficiency and offer opp ortunities for 
quick responses to plants nutrients needs. This has led to a need to develop special 
fertilizers that can be applied using these new technologies.  
 
 Like other fertilizer products, environmental aspects related to fertilizer raw materials ha ve 
been taken care of,  thus limits for heavy metals have been specified. Recent Association 
of official Analytical chemists (AOAC) methods of analysis have been adopted.  
 
 
 
During the preparation of this standard, reference was ma de to the following docume nt: 
 
1. 2012 , FAO mineral fertilizer specifications,  
2. EU Cadmium limits, 2018  
 
 
  
 KENYA STANDARD   
Monopotassium phosphate Fertilizer — Specification  
 
1 Scope  
 
This Kenya Standard specifies requirements and metho ds of test for 
Monopotassium phosphate Fertiliz er, technical grade  
 
2 Requirements  
 
2.1 Description   
The fertilizer shall be free flowing, in form of granules, pellets, crystals or ;prills, free 
from any foreign matter and shall not cake on storage   
 
 
 
2.2. Physical  
 
The fertilizer product shall be fully s oluble in water  
 
2.3 Chemical  
 
The fertilizer shall conform to  the requirements given in Table 1  
 
 
 
 
 
Table 1 — Requirements  for mono potassium phosphate fertilizer  
 
  
SL 
NO Characteristic  Requirement/l
imit Test 
method  
1 Available phosphate content, as 
P2O5,% w/w, Min  51.5 AOAC  
2             Potassium content, as K 2O,% w/w, 
min 33.5 AOAC  
     3 pH(1% solution) , 4.0-5.0 AOAC  
     4. Moisture,% w/w, Max  0.5 AOAC  
     5  Water insolubles, %,w/w.max             0.5     AOAC  
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
The presence of heav y metal contaminants shall not exceed the limits stipulated 
in Table 2.  
 
 
 
Table 2 — Heavy metal contaminants  
 
SL NO  Parameter  Limits, in ppm  Test method  
i) Arsenic, As, 
max. 20.0 AOAC  
ii) Cadmium, Cd, 
max. 15 AOAC  
iii) Mercury, Hg, 
max. 0.1 AOAC  
iv) Selenium, Se, 
max. 1.0 AOAC  
v) Lead, Pb, max.  30.0 AOAC  
vi) Chromium, Cr, 
max. 500.0  AOAC  
 
 
3 Packaging and marking/labelling  
3.1 Packaging   
 
3.1.1 The fertilizer shall be packaged in materials that ensure the product integrity 
and quality against physic al damage, chemical and moisture contamination.  
 
3.1’2. the fill of the package shall comply with the weight and measures act CAP 
513 of the laws of Kenya  
 
3.1.3 The disposal of used package and condemned fertilizer shall comply with 
EMCA 1999 no.8 of the  disposal of solids and liquid wastes  
 
3.2 Marking/labelling   
 
Each packaging container bag shall be marked/  labelled with the following information:  
 
a) Name of the fertilizer, as “mono potassium  phosphate fertilizer ”; 
 
b) Name, address and physical location of th e manufacturer/packer/importer;  
 
c)    country of origin/manufacture;  
 
d) Date of manufacture  
 
e) The form in which the nutrients are present.  
  
3 
 f) expiry date  
 
g) the content net weight;  
 
h) batch/lot number;  
 
i) Handling  instructions.  
 
4 Certificate of analysis  
 
A certificate  of analysis shall accompany each consignment.  
5 Sampling  
This shall be carried as outlined in the ISO standards ISO 8633 and  8634.  
 
 
ISO 8633 -Solid fertilizers -- Simple sampling method for small lots  
ISO 8634 - Solid fertilizers -- Sampling plan for the ev aluation of a large delivery