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Do you need control materials to validate your methods or carry out your quality control?

In addition to organizing proficiency testing schemes, we provide you with leftover samples from proficiency testing rounds in the agri-food and environmental fields. These are available for laboratories that wish to develop internal quality controls with safe samples. All of them come with a certificate that includes:

  • Assigned value and associated uncertainty, and the number of laboratories assigning it
  • Details about the nature of the sample, representative of the matrices commonly analyzed

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GSCA-1/2025

Drinking water

M1: Chlorides (mg/L) Conductivity at 20ºC (µS/cm) Fluorides (mg/L) Phosphates (mg/L as phosphate ion) Total phosphorus (mg/L P) Nitrates (mg/L) Nitrites (mg/L) pH (pH units) Potassium (mg/L) Sodium (mg/L) Sulfates (mg/L SO4)

GSCA-2/2025

Continental waters

Drinking water

MB: TOTAL CYANIDES (µg/L).

MC: ALKALINITY (mg/L CaCO3), BICARBONATES (mg/L CaCO3), CALCIUM (mg/L Ca), CARBONATES (mg/L CaCO3), CHLORIDES (mg/L), CONDUCTIVITY AT 20 ºC (µS/cm), HARDNESS (mg/L CaCO3), LANGELIER INDEX (-), MAGNESIUM (mg/L Mg), NITRATES (mg/L), NITRITES (mg/L), pH (upH), POTASSIUM (mg/L), DRY RESIDUE AT 180 ºC (mg/L), SODIUM (mg/L), SULFATES (mg/L SO4)

GSCAR-1 2025

Wastewater

Wastewater

MA: COPPER (mg/L), TOTAL CHROMIUM (µg/L Cr), COD (mg O2/L), PHOSPHATES (mg/L), FLUORIDES (mg/L), TOTAL PHOSPHORUS (mg/L P), IRON (mg/L Fe), MERCURY (µg/L Hg), NITRATES (mg/L), AMMONIUM NITROGEN (mg/L N), KJELDAHL NITROGEN (mg/L N), TOTAL NITROGEN (mg/L N)

MB: CHLORIDES (mg/L as chloride ion), CONDUCTIVITY AT 25ºC (µS/cm), BOD5 (mg O2/L), pH (upH)

MC: SUSPENDED SOLIDS (mg/L)

GSCCA-1/2025

Fishery Product (Crab Meat)

Food Preservatives

M1: SODIUM METABISULFITE (SULFUR DIOXIDE) (MG/KG SO₂)

GSCGLU-1/2024

Meat product (Cooked ham)

Allergens in foods

M1: GLUTEN (mg/kg)

GSCGLU-1/2025

Meat Product (Hamburger)

Food allergens

M1: GLUTEN (MG/KG)

GSCMAC-1/2025

Drinking water

Water for human consumption and inland waters: Metals

M1: Aluminum (µg/L) Cadmium (µg/L) Copper (µg/L) Total Chromium (µg/L) Iron (µg/L) Manganese (µg/L) Mercury (µg/L) Nickel (µg/L) Lead (µg/L) Zinc (µg/L)

GSCMPA-1/2024

Swordfish

Heavy metals in food

M1: Arsenic (mg/kg) Cadmium (mg/kg) Copper (mg/kg) Tin (mg/kg) Iron (mg/kg) Manganese (mg/kg) Mercury (mg/kg) Lead (mg/kg) Zinc (mg/kg)

GSCMPA-1/2025

Mussel

Heavy metals in foods

M1: Arsenic (mg/kg) Cadmium (mg/kg) Copper (mg/kg) Tin (mg/kg) Iron (mg/kg) Manganese (mg/kg) Mercury (mg/kg) Lead (mg/kg) Zinc (mg/kg)

GSCNI/2023

Lettuce

NITRATOS EN FRUTAS Y HORTALIZAS

M1: Nitrates (mg/kg)*

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