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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)

GSCCA-2/2024

Quince

Preservatives in Food

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

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-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)

GSCNI/2024

Chard

Nitrates in Fruits and Vegetables

M1: NITRATES (mg/kg)

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)

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)

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91 551 92 52  –  gscsal@gscsal.com