Micronutrient Sulphates: Zinc, Copper, Manganese & Ferrous Sulphate

Fertilizer-grade ZnSO₄, CuSO₄, MnSO₄ and FeSO₄ | mono- and heptahydrate for blenders and foliar formulators

Micronutrient sulphates are bought on the metal assay and the heavy-metal line. Zinc sulphate monohydrate (ZnSO₄·H₂O) is the workhorse grade at 33% Zn minimum, sold as powder or as 0.5–1, 1–2 and 2–4 mm granules for bulk blending, with producer sheets capping lead at 10 ppm, arsenic at 5 ppm and cadmium at 10 ppm; the heptahydrate (ZnSO₄·7H₂O) runs 21.5–22% Zn and is the crystal grade for soil application and foliar solutions where the extra water of crystallisation does not matter. Copper sulphate pentahydrate (CuSO₄·5H₂O) is 25.47% Cu by formula and commercially 24.5–25% Cu minimum at 98% purity, used as a copper micronutrient and as the base of Bordeaux mixture. Manganese sulphate monohydrate (MnSO₄·H₂O) is 32.6% Mn by formula and about 30.5–32% Mn as a fertilizer grade. Ferrous sulphate monohydrate is offered at 30% Fe minimum (lead ≤ 20 ppm, arsenic ≤ 2 ppm, cadmium ≤ 5 ppm) and the heptahydrate at about 19–20% Fe; much ferrous sulphate is a by-product stream, which is why the impurity certificate matters as much as the assay.

The buyers are NPK blenders adding zinc to compound grades, foliar and fertigation formulators who need full solubility and low insolubles, and seed-coating and chelate producers who take the sulphate as their raw material. Customs reporting puts zinc, manganese and ferrous sulphate under HS 2833.29 (other sulphates) and copper sulphate under HS 2833.25, so origin is read line by line: China (Liaoning and other producers), India (Gujarat and Rajasthan micronutrient works), European producers of copper and iron sulphate, and Chilean copper sulphate made alongside the copper industry. CBIL brokers micronutrient sulphates against an SGS, Intertek or Bureau Veritas certificate of analysis for the metal assay, water-insolubles and lead, arsenic, cadmium and mercury, with the certificate of origin and, for the EU, the contaminant limits of Regulation 2019/1009, in 25 kg and 50 kg woven bags with liner, and 1,000–1,350 kg jumbo bags. Copper sulphate carries GHS corrosive and environmental-hazard labelling and is documented accordingly for sea freight. Prices are negotiated per MT on grade and pack.

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Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.