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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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GSC JUICE/2024

Orange juice

JUICE

M1A: Total acidity (g citric acid/100 mL)(1), Total sugars (%)(1), Density (20ºC/20ºC)(1), Fructose (mg/100 mL)(1), Glucose (mg/100 mL)(1), Brix degrees at 20ºC (°Brix), Sucrose (mg/100 mL)(1)

M1B: Sulfur dioxide (mg/L)(1)

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)

GSCA-4/2024

Drinking water

Drinking Water and Freshwater

MA: Ammonium (mg/L)

MB: True color (mg/L Pt/Co), Turbidity (UNF)

MC: Conductivity at 20ºC (µS/cm)(2), Hardness (mg/L CaCO3), Fluorides (mg/L), Phosphates (mg/L as phosphate ion), Total phosphorus (mg/L P), Nitrates (mg/L), Nitrites (mg/L)(1), pH (pH units)(2), Potassium (mg/L), Sodium (mg/L)

MD: Chlorates (mg/L)(3), Chlorites (mg/L)(3)

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)

GSCGLU-2/2024

Breadcrumbs

Allergens in Food

M1: Gluten (mg/kg)

GSCHIS/2024

Tuna

Histamine in Fishery Products

M1: HISTAMINE (mg/kg)

GSCMEAT/2024

Turkey breast

M1A: Water activity, Ashes (%), Total phosphorus (mg/kg P2O5), C16:0 Palmitic acid (%), C16:1 Palmitoleic acid (%)*, C18:1 Oleic acid (%), C18:2n6 Linoleic acid (%), C18:3n3 Linolenic acid (%)*, Monounsaturated fatty acids (%), Polyunsaturated fatty acids (%), Saturated fat (%), Fat (%), Carbohydrates (%), Hydroxyproline (%)*, Moisture (%)(1), pH (pH units), Crude protein (N% x 6.25) (%), Salt (g/100g NaCl), Sodium (%), Energy value (kcal/100g)

M1B: Nitrates (mg/kg Sodium nitrate), Nitrites (mg/kg Sodium nitrite)(1)

GSCPC-2/2024

Toasted bread

M1: Acrylamide (µg/kg)

GSCRES-2/2024

Olive paste

M1: Acetamiprid (µg/kg), Benalaxyl (µg/kg), Bromopropylate (µg/kg), Carbaryl (µg/kg), Cypermethrin (µg/kg), Chlorpyrifos (µg/kg), Chlorpyrifos-methyl (µg/kg), Deltamethrin (µg/kg), Difenoconazole (µg/kg), Diuron (µg/kg), Etion (µg/kg), Kresoxim-methyl (µg/kg), Linuron (µg/kg), Malathion (µg/kg), Methidathion (µg/kg), Methomyl (µg/kg), Pirimicarb (µg/kg), Prometryn (µg/kg), Propamocarb (µg/kg), Propoxur (µg/kg)(1), Simazine (µg/kg), Tebuconazole (µg/kg), Tetradifon (µg/kg), Thiabendazole (µg/kg), Thiacloprid (µg/kg), Vinclozolin (µg/kg)

GSCWINE-1/2024

Red wine

WINES: QUALITY PARAMETERS

M1A: Total acidity (g tartaric/L)*, Volatile acidity (g tartaric/L)*, Reducing sugars (g/L)*, Dry extract (g/L)*, Glycerol (g/L)*, Glucose (g/L)*, Alcohol content (% Vol)*, Density at 20ºC (g/mL)*, pH (-)

M1B: Gluconic acid (g/L)*, L-Malic acid (g/L)*, Free sulfur dioxide (mg/L), Total sulfur dioxide (mg/L)(2)

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