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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-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)

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)

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-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/2024

Chard

Nitrates in Fruits and Vegetables

M1: NITRATES (mg/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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