Open Call for Tenders for laboratories participating in inter-laboratory studies in the field of Fertilizing Products

Open Call for Tenders for laboratories participating in inter-laboratory studies in CEN/TC 260/WG 7 “Inorganic fertilizers and inhibitors” and CEN/TC 260/WG 3 “Liming materials”

With Standardization Request M/564 and its amendments (M/564 Amd1 and M/564 Amd 2), the European Commission charged the European Committee for Standardization (CEN) to elaborate harmonized European Standards and European standardization deliverables in the framework of Regulation (EU) 2019/1009 on fertilising products.

In this context, we are looking for laboratories participating in the inter-laboratory studies of the following work items in CEN/TC 260/WG 7 “Inorganic fertilizers and inhibitors” and CEN/TC 260/WG 3 “Liming materials”:

Organo-mineral fertilizers — Determination of the N-(nbutyl)thiophosphoric triamide (NBPT) urease inhibitor content;
Inorganic fertilizers – Determination of total nitrogen in methylene urea and urea formaldehyde (revision of EN 15478:2009);
Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with a pH of 7,5 at 100 °C (revision of CEN/TS 17403:2021);
Inorganic fertilizers - Determination of the free formaldehyde content in nutrient polymers;
Inorganic fertilizers - Determination of the total K₂O content;
Inorganic fertilizers - Determination of the organic carbon content in ammonium nitrate fertilizers of high nitrogen content;
Inorganic fertilizers - Determination of pH of a solution of ammonium nitrate fertilizer of high nitrogen content (revision of CEN/TS 17759:2022);
Inorganic fertilizers - Determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content (revision of CEN/TS 17761:2022);
Inorganic fertilizers - Determination of the copper content in ammonium nitrate fertilizers of high nitrogen content (revision of CEN/TS 17762:2022);
Fertilizers and liming materials – Determination of the chloride content by potentiometric titration (revision of CEN/TS 17758:2022);
Inhibitors - Determination of the chloride content by ion chromatography and conductivity detection (IC-CD);
Fertilizers, liming materials and inhibitors - Determination of the phosphonates content.