How to Import Chelated Micronutrients from China: A Buyer's Guide

Which chelate route fits which situation (RunziChem grades; assays typical, confirmed per batch COA)

China's chelate supply is not the same market as bulk salts

Importing a chelate is a different sourcing problem from importing a straight salt. Zinc sulphate, ferrous sulphate and manganese sulphate are commodity inorganic salts made at very large tonnage by many plants; quality varies little. EDTA and EDDHA chelates are synthesized organic products: fewer facilities actually make them, quality spreads far wider, and a large share of "suppliers" you find online are trading intermediaries relabeling other people's material.

That structure is the real sourcing risk. With a chelate, the number on the bag — "Zn 15%" or "Fe 6%" — does not tell you how much of the metal is genuinely held in the chelate ring, and for iron chelates it does not tell you whether the product will survive your soil pH at all. So the buyer's job shifts from price-shopping a commodity to verifying who actually manufactures the material and what its certificate of analysis really certifies. RunziChem manufactures its EDTA and EDDHA-Fe range factory-direct from Zouping, Shandong, and ships FOB, CFR or CIF from Qingdao — but the checks below apply to any Chinese chelate supplier, us included.

Step 1 — Verify the manufacturer, not just the offer

Confirm you are dealing with the maker, or a trader who can name the maker, before you discuss price. Ask directly: do you manufacture this, or source it? A genuine manufacturer can show third-party records that a trader cannot fabricate. On our verification page those are laid out to check yourself in about five minutes: a Bureau Veritas on-site factory assessment through Alibaba's Verified Supplier program, ISO 9001 certification, shipment-level export records in Volza customs data, a Dun & Bradstreet business record, and the open knowledge-graph entity Wikidata Q140352948. Open each source and compare its record against what the website claims. Any supplier worth a container can point you to independent records; if every "proof" traces back to the supplier's own marketing, treat the offer with caution.

Step 2 — How to read a chelate COA (the part most guides skip)

This is where chelate imports go wrong, so it gets its own step. Three traps hide inside a normal-looking certificate of analysis.

Chelated content is not the same as total content. A label that reads "Zn 15%" states the total zinc by weight. What actually protects that zinc from fixing in soil or reacting in the spray tank is the fraction genuinely held inside the EDTA ring — the chelated content. Under the EU Fertilising Products Regulation (2019/1009), a product may be declared a chelate only when at least 80% of the water-soluble micronutrient is chelated, and the label must state the chelating agent and the chelated percentage. Most other markets do not force that onto the bag, so the safe move is simple: ask for the chelated figure — not just the total metal — on the batch COA.

For EDDHA-Fe, the number that matters is the ortho-ortho (o,o) isomer, not the 6%. Total iron in EDDHA-Fe is typically about 6%, but only the ortho-ortho isomer's binding geometry holds iron in the stable complex that stays available in calcareous, high-pH ground; the other isomers are far less effective there (Molecules/MDPI isomer-stability work). Two bags can both say "Fe 6%" and behave completely differently. RunziChem EDDHA-Fe 6% specifies ortho-ortho 4.8% explicitly. If a supplier quotes EDDHA-Fe with no o,o figure, treat the "6%" as unverified for high-pH use and ask for the o,o number before you compare prices.

Insist the COA is per batch, and that the batch number matches your drums. A TDS or spec sheet describes what the product is meant to be; a batch COA describes what is actually in your container. The lot number on the certificate should match the lot printed on the packaging. A generic COA reused across every shipment is a document, not a guarantee — RunziChem issues a COA per batch alongside the TDS and SDS.

Step 3 — Match the chelate to your soil pH

Buy the chelate your ground actually needs, not the strongest one on the shelf. The deciding factor is soil pH, because iron and the other metals lock up as pH rises. University of Florida IFAS data puts the practical limits at about pH 6.5 for Fe-EDTA, about pH 7.5 for Fe-DTPA, and about pH 9 for Fe-EDDHA. In plain terms: on acid-to-near-neutral soils, in fertigation, and in water-soluble-fertilizer manufacturing, single-element EDTA chelates do the job economically; on calcareous, high-pH soils where iron chlorosis is chronic, EDDHA-Fe is the reliable route and EDTA-Fe is largely wasted. RunziChem supplies EDTA and EDDHA grades; DTPA appears in the table only because buyers ask to compare — we do not supply DTPA. The full pH-stability curves and cost logic are in our EDTA vs sulphate vs EDDHA comparison and the iron fertilizer sources guide.

Step 4 — Export documents, HS codes and registration

Two questions decide the paperwork: what customs code the goods travel under, and who holds the product registration in the destination market. On HS codes, formulated EDTA micronutrient chelates that contain no N, P or K are commonly classified under 3824.99 (chemical preparations, n.e.s.), while the EDTA molecule and its simple salts sit at 2922.49 — single-compound chelates have sometimes been ruled into Chapter 29, so confirm the exact line with your broker. Our HS-code reference maps the common product categories. On registration, in most markets the importer holds the fertilizer registration and the supplier provides the dossier — batch COA, TDS, SDS, composition statement, and certificate of origin. RunziChem provides that documentation package and registration assistance through our partner program, and our country guides cover import requirements for markets such as Brazil, Vietnam and the UAE / GCC, among nine in total.

Step 5 — Shipping from Qingdao and how to compare prices

RunziChem ships FOB, CFR or CIF from Qingdao port with a TDS, batch COA and SDS on every shipment. When you compare quotes, compare on the unit that does the work — the price per unit of chelated nutrient, not the price per tonne of product. Two offers at the same tonne price are not equal if one carries a lower chelated fraction, and two EDDHA-Fe offers at the same "6%" are not equal if one has less ortho-ortho iron. The usual cost ladder — EDDHA-Fe above EDTA above sulphate — reflects the cost of the chelating agent and its synthesis, not a markup. Ask for a current quotation for exact pricing and lead time; figures move with grade, o,o content and order volume.

FAQ: Is chelated always better than a sulphate salt?

No — it depends on soil pH and application method. Below roughly pH 6.5, sulphate micronutrients often correct deficiency at a fraction of the cost, and on foliar sprays the gap narrows further because the leaf bypasses soil fixation. Chelates earn their premium on high-pH, calcareous ground and in fertigation or complex tank mixes, where free metal ions would lock up or react. A supplier who says one form fits every situation is not reading the same agronomy data you should be.

FAQ: Which figures should I insist on seeing on the COA?

Four: the chelated content (not only the total metal percentage); for EDDHA-Fe, the ortho-ortho isomer percentage; the batch/lot number, which should match your packaging; and water-solubility. If any of these is missing, ask before you order — for a chelate, those numbers are the product, and a total-metal figure alone can hide a weak chelated fraction.

FAQ: Do I register the product, or does the supplier?

In most import markets the importer holds the fertilizer registration and the overseas manufacturer supplies the supporting dossier — batch COA, TDS, SDS, composition and origin documents. RunziChem supplies that documentation package and registration assistance, but the destination registration is normally held locally. Confirm the exact route with your national fertilizer authority or customs broker; our country import guides outline the requirements market by market.

FAQ: Can I order a custom or private-label chelated blend?

Yes. Alongside the six single-element EDTA grades and EDDHA-Fe, RunziChem produces two standard compound EDTA blends that deliver the full trace-element set in one water-soluble powder, and can produce custom blends to a buyer's specified analysis, subject to a feasibility check and sample COA. OEM support includes private-label packaging, per-batch COA and TDS/SDS documentation. See the EDTA chelated micronutrients hub for full specifications and the compound-grade analyses.