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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-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)

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)

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)

GSCAR-2 2024

Wastewater

Aguas residuales

MA: ARSENIC (mg/L), CADMIUM (mg/L), COT (mg/L), ANIONIC DETERGENTS (mg Sodium Lauryl Sulfate/L)(1), COD (mg O2/L), PHENOLS (mg/L)(1), LEAD (mg/L),

MB: CHROMIUM VI (mg/L)(1)

MC: BOD5 (mg O2/L)(1)(3), pH (upH)(2)

MD: CHLORIDES (mg/L), CONDUCTIVITY AT 25 ºC (mS/cm)(2), SUSPENDED SOLIDS (mg/L)(4)

ME: CATIONIC DETERGENTS (mg/L)(1)

GSCAR-3/2024

Wastewater

WASTEWATER

MA: COD (mg O2/L)(5), TOTAL PHOSPHORUS (mg/L P), MERCURY (µg/L Hg), NICKEL (µg/L), KJELDAHL NITROGEN (mg/L N), ZINC (µg/L)

MB: CONDUCTIVITY AT 25 ºC (µS/cm) (3), BOD5 (mg O2/L) (1)(2), PH (upH) (3)

MC: SUSPENDED SOLIDS (mg/L) (4)

ME: BARIUM (mg/L), TIN (mg/L)

GSCAR-4 2024

Wastewater

Wastewater

M1: TOXICITY (INHIBITORY SUBSTANCES), EQUITOX

M2: TOXICITY (INHIBITORY SUBSTANCES), EQUITOX

GSCAS/2024

Seawater

High-Salinity Water

M1A: Chlorides (mg/L), Conductivity at 20ºC (mS/cm), Phosphates (mg/L as PO4), Total Phosphorus (mg/L P)(3), Nitrates (mg/L), Nitrites (mg/L)(1), Kjeldahl Nitrogen (mg/L N)*, pH (upH)(1)(2), Salinity (g/L)(3), Sulfates (mg/L)

M1B: Ammonium (mg/L)*, Arsenic (µg/L), Boron (mg/L)*, Copper (µg/L), Iron (µg/L), Mercury (µg/L), Nickel (µg/L), Lead (µg/L)

GSCCA-1/2024

Food Preservatives

M1: SODIUM METABISULFITE (SULFUR DIOXIDE) (mg/kg SO2)

GSCCA-1/2025

Fishery Product (Crab Meat)

Food Preservatives

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

GSCCA-2/2024

Quince

Preservatives in Food

M1: Sodium metabisulfite (Sulfur dioxide) (mg/kg SO2)

GSCCER 2024

Whole Wheat Pasta

Nutritional Composition in Food

M1: ASH AT 550ºC (% w/w), DIETARY FIBER (% w/w), FAT (% w/w), SATURATED FAT (%), METABOLIZABLE CARBOHYDRATES (% w/w) (TOTAL CARBOHYDRATES (% w/w)), MOISTURE AT 130ºC (% w/w), PROTEIN (N% x 6.25) (% w/w), SALT (%), SODIUM (% Na), ENERGY VALUE (kcal/100g)

GSCFEED-4/2024

Animal Feed and Wheat

Animal Feed

M1: Starch* 5 29.24 3.39 23.39 35.09, Ash at 550ºC 10 7.59 0.15 6.07 9.11, Ash at 550ºC 8 3.31 0.49 1.99 4.63, Crude fat without prior hydrolysis 8 12.2 0.6 9.8 14.6, Moisture at 103ºC 10 8.6 0.5 6.9 10.3, Crude protein (N% x 6.25) 10 25.52 0.57 22.97 28.07

M2: Starch* 7 60.02 3.07 48.02 72.02, Ash at 550ºC 10 1.54 0.07 1.23 1.85, Crude fiber* 6 2.57 0.26 2.06 3.08, Crude fat without prior hydrolysis 8 1.44 0.16 1.15 1.73, Moisture at 130ºC 9 10.7 0.7 8.6 12.8, Crude protein (N% x 6.25) 10 11.6 0.31 10.5 12.8, Crude ash (IR)* 3 1.61 0.36 1.29 1.93, Crude fat without prior hydrolysis IR* 3 1.55 0.44 1.24 1.86, Moisture IR* 3 11.1 0.6 10.0 12.2, Crude protein (N% x 6.25) IR* 3 11.51 0.2 10.36 12.66

GSCFOL 2024

M1: Hoja de olivo M2: Hoja de naranjo

Foliar

M1: Boron, Calcium, Copper, Total Phosphorus, Iron, Magnesium, Manganese, Kjeldahl Nitrogen, Potassium, Zinc

M2: Boron, Calcium, Copper, Total Phosphorus, Iron, Magnesium, Manganese, Kjeldahl Nitrogen, Potassium, Zinc

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)

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)

GSCMEAT 2023

Saxon chop

Nutritional composition of foods

M1A: Water activity, Ashes, Total phosphorus (mg/kg P2O5), Fat, Saturated fats, Carbohydrates, Hydroxyproline, Moisture, pH (uph), Crude protein, Salt, Sodium, Energy value (kcal/100g)

M1B: Nitrates (mg/kg sodium nitrate)

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)

GSCMIA-6 2024

M1: Cured Cheese M2: Canned Tuna

M1: DETECTION OF STAPHYLOCOCCAL ENTEROTOXIN (P/N IN 25G)

M2: DETECTION OF STAPHYLOCOCCAL ENTEROTOXIN (P/N IN 25G)

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)

GSCMPA-2 2023

Fresh spinach

Heavy metals in foods

M1: Arsenic (mg/kg), Cadmium (mg/kg), Copper (mg/kg), Chromium (mg/kg), Tin (mg/kg), Iron (mg/kg), Mercury (mg/kg), Lead (mg/kg), Selenium (mg/kg), Zinc (mg/kg)

GSCMPA-2/2024

Crushed Cabbage

Heavy Metals in Food

M1: ARSENIC (mg/kg), CADMIUM (mg/kg), COPPER (mg/kg), CHROMIUM (mg/kg), TIN (mg/kg), IRON (mg/kg), MERCURY (mg/kg), LEAD (mg/kg), SELENIUM (mg/kg), ZINC (mg/kg)

GSCMPA-3/2024

Red wine

Heavy metals in food

M1: CALCIUM (mg/kg), COPPER (mg/kg), IRON (mg/kg), MAGNESIUM (mg/kg), MANGANESE (mg/kg), LEAD (mg/kg), POTASSIUM (mg/kg), SODIUM (mg/kg), ZINC (mg/kg)

GSCNI/2023

Lettuce

NITRATOS EN FRUTAS Y HORTALIZAS

M1: Nitrates (mg/kg)*

GSCNI/2024

Chard

Nitrates in Fruits and Vegetables

M1: NITRATES (mg/kg)

GSCNU 2024

Prepared dish (Chickpea salad)

Nutritional composition in foods

M1: Total sugars (% w/w), Calcium (mg/100g)*, Ashes (% w/w), Energy (kcal/100g)*, Dietary fiber (% w/w)*, Total phosphorus (mg/100g)*, Crude fat with prior hydrolysis (% w/w), Saturated fats (% w/w)*, Metabolizable carbohydrates (% w/w)*(2), Total carbohydrates (% w/w)*(2), Moisture (% w/w)(1), Crude protein (N × 6.25) (% w/w), Sodium (mg/100g)

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)

GSCSLU/2024

Sludge

M1: Total calcium (% (CaO) d.w.)* Conductivity at 25ºC (1:5) (µS/cm)* Total phosphorus (% (P2O5) d.w.)* Iron (mg/kg d.w.)* Total magnesium (% (MgO) d.w.)* Organic matter (% d.w.) Dry matter (%) Kjeldahl nitrogen* (% d.w.)* pH (1:5) (in aqueous extract) (pH units)* Total potassium (% (K2O) d.w.)*

GSCSU/2024

Agricultural Soils

Agricultural Soils

M1: Ammonium acetate-extractable calcium (not CIC corrected) (meq/100g soil), Active limestone (% CaCO3 soil)*, Cation exchange capacity (meq/100g soil), Calcium carbonate (% CaCO3 soil)*, Conductivity at 25ºC (1:2.5) (on aqueous extract) (mS/cm), Conductivity at 25ºC (1:5) (on aqueous extract) (mS/cm), Olsen phosphorus (mg/kg P soil), Moisture (%) (1), Ammonium acetate-extractable magnesium (not CIC corrected) (meq/100g soil), Total organic matter (% soil), Nitrates (mg/kg soil)*, Kjeldahl nitrogen (% N soil), Total nitrogen (% N soil), pH (1:2.5) (on aqueous extract) (-), pH (1:5) (on aqueous extract) (-), Ammonium acetate-extractable potassium (meq/100g soil), Ammonium acetate-extractable sodium (meq/100g soil)*, USDA texture (% clay) (% clay)*, USDA texture (% sand) (% sand), USDA texture (% silt) (% silt)

GSCTOX-5/2024

Raisins

MYCOTOXINS IN FOOD

M1: Ochratoxin A (µg/kg)(1)

GSCTOX-7/2024

Corn-Based Breakfast Cereals

MYCOTOXINS IN FOOD

M1: Deoxynivalenol (DON) (µg/kg), Fumonisin B1 (µg/kg), Fumonisin B2 (µg/kg), Sum of Fumonisins B1 and B2 (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)

GSCWINE-3/2024

White wine

Wines, Quality Parameters

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

M1B: Citric acid* (g/L), L-malic acid* (g/L), Sorbic acid* (mg/L), Free sulfur dioxide* (1) (mg/L), Total sulfur dioxide* (1) (mg/L)

OLIVE OIL-1/2024

Olive oil

OLIVE OIL: QUALITY PARAMETERS

M1: K232 (-), K268 (-)*, K270 (-), Delta-K (-), Total acidity (% oleic acid), Peroxides (meq O2/kg), Ethyl esters (mg/kg)

M2A: K232 (-), K268 (-)*, K270 (-), Delta-K (-), Total acidity (% oleic acid), Peroxides (meq O2/kg), Ethyl esters (mg/kg)

M2B: Moisture (%), Impurities (%)

OLIVE OIL-1/2025

OLIVE OIL

OLIVE OIL QUALITY PARAMETERS

M1: K232 (-), K268 (-), K270 (-), Delta-K (-), Total acidity (% oleic acid), Peroxides (meq O₂/kg), Ethyl esters (mg/kg)

M2A: K232 (-), K268 (-), K270 (-), Delta-K (-), Total acidity (% oleic acid), Peroxides (meq O₂/kg), Ethyl esters (mg/kg),

M2B: Moisture (%), Impurities (%)

OLIVE OIL-2 2024

Olive Oil

Olive Oil. Purity Parameters

ACEITE DE OLIVA – PARÁMETROS DE PUREZA

M1: Ácido láurico (12:0) (%), Ácido mirístico (14:0) (%), Ácido palmítico (16:0) (%), Ácido palmitoleico (16:1) (%), Ácido heptadecanoico (17:0) (%), Ácido heptadecenoico (17:1) (%), Ácido esteárico (18:0) (%), Ácido oléico (18:1) (%), Ácido linoléico (18:2) (%), Ácido linolénico (18:3) (%), Ácido araquídico (20:0) (%), Ácido eicosenoico (20:1) (%), Ácido behénico (22:0) (%), Ácido erúcico (22:1) (%), Ácido lignocérico (24:0) (%), Isómeros trans oléicos (%), Isómeros trans linoleicos + linolénicos (%), Colesterol (%), Brasicasterol (%), Campesterol (%), Estigmasterol (%), Delta-7-estigmastenol (%), Beta-sitosterol (%), Beta-sitosterol aparente (%), Esteroles totales (mg/kg), Monopalmitato de 2-glicerilo (%), Ceras (C40+C42+C44+C46) (mg/kg), Ceras (C42+C44+C46) (mg/kg), Diferencia ECN-42 (-), Eritrodiol + Uvaol (%), Alcoholes alifáticos totales (mg/kg), Estigmastadienos (mg/kg), Insaponificable (%), Relación 1:2/1:3 diglicéridos (%), Valor real ECN-42 (-). M2: Ácido láurico (12:0) (%), Ácido mirístico (14:0) (%), Ácido palmítico (16:0) (%), Ácido palmitoleico (16:1) (%), Ácido heptadecanoico (17:0) (%), Ácido heptadecenoico (17:1) (%), Ácido esteárico (18:0) (%), Ácido oléico (18:1) (%), Ácido linoléico (18:2) (%), Ácido linolénico (18:3) (%), Ácido araquídico (20:0) (%), Ácido eicosenoico (20:1) (%), Ácido behénico (22:0) (%), Ácido erúcico (22:1) (%), Ácido lignocérico (24:0) (%), Isómeros trans oléicos (%), Isómeros trans linoleicos + linolénicos (%), Colesterol (%), Brasicasterol (%), Estigmasterol (%), Delta-7-estigmastenol (%), Beta-sitosterol (%), Beta-sitosterol aparente (%), Esteroles totales (mg/kg), Monopalmitato de 2-glicerilo (%), Ceras (C40+C42+C44+C46) (mg/kg), Ceras (C42+C44+C46) (mg/kg), Diferencia ECN-42 (-), Eritrodiol + Uvaol (%), Alcoholes alifáticos totales (mg/kg), Estigmastadienos (mg/kg), Insaponificable (%), Relación 1:2/1:3 diglicéridos (%)*, Valor real ECN-42 (-).

OLIVE OIL-2/2025

OLIVE OIL

OLIVE OIL – PURITY PARAMETERS

M1: Lauric acid (12:0) (%), Myristic acid (14:0) (%), Palmitic acid (16:0) (%), Palmitoleic acid (16:1) (%), Heptadecanoic acid (17:0) (%), Heptadecenoic acid (17:1) (%), Stearic acid (18:0) (%), Oleic acid (18:1) (%), Linoleic acid (18:2) (%), Linolenic acid (18:3) (%), Arachidic acid (20:0) (%), Eicosenoic acid (20:1) (%), Behenic acid (22:0) (%), Erucic acid (22:1) (%), Lignoceric acid (24:0) (%), Trans-oleic isomers (%), Trans-linoleic + linolenic isomers (%), Cholesterol (%), Brassicasterol (%), Campesterol (%), Stigmasterol (%), Delta-7-stigmastenol (%), Beta-sitosterol (%), Apparent beta-sitosterol (%), Total sterols (mg/kg), 2-Monopalmitoyl glycerol (%), Waxes (C40+C42+C44+C46) (mg/kg), Waxes (C42+C44+C46) (mg/kg), ECN-42 difference (-), Erythrodiol + Uvaol (%), Total aliphatic alcohols (mg/kg), Stigmastadienes (mg/kg), Unsaponifiables (%), 1:2 / 1:3 diglyceride ratio (%), Actual ECN-42 value (-)

M2: Lauric acid (12:0) (%), Myristic acid (14:0) (%), Palmitic acid (16:0) (%), Palmitoleic acid (16:1) (%), Heptadecanoic acid (17:0) (%), Heptadecenoic acid (17:1) (%), Stearic acid (18:0) (%), Oleic acid (18:1) (%), Linoleic acid (18:2) (%), Linolenic acid (18:3) (%), Arachidic acid (20:0) (%), Eicosenoic acid (20:1) (%), Behenic acid (22:0) (%), Erucic acid (22:1) (%), Lignoceric acid (24:0) (%), Trans-oleic isomers (%), Trans-linoleic + linolenic isomers (%), Cholesterol (%), Brassicasterol (%), Campesterol (%), Stigmasterol (%), Delta-7-stigmastenol (%), Beta-sitosterol (%), Apparent beta-sitosterol (%), Total sterols (mg/kg), 2-Monopalmitoyl glycerol (%), Waxes (C40+C42+C44+C46) (mg/kg), Waxes (C42+C44+C46) (mg/kg), ECN-42 difference (-), Erythrodiol + Uvaol (%), Total aliphatic alcohols (mg/kg), Stigmastadienes (mg/kg), Unsaponifiables (%), 1:2 / 1:3 diglyceride ratio (%), Actual ECN-42 value (-)

OLIVE OIL-3/2024

Olive Oil

Olives Oil

MA: ARSENIC (mg/kg) (1), CADMIUM (mg/kg), MERCURY (mg/kg) (1), LEAD (mg/kg) (1)

MB: Benzo(a)anthracene (µg/kg) (2), Benzo(a)pyrene (µg/kg), Benzo(b)fluoranthene (µg/kg), Chrysene (µg/kg) (1), Acetamiprid (µg/kg) (2), Chlorpyrifos (µg/kg) (1), Chlorpyrifos-methyl (µg/kg) (2), Ethion (µg/kg) (2), Phenthoate (µg/kg) (2), Propamocarb (µg/kg) (2), Propoxur (µg/kg) (1)

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