+34 91 551 92 52  –  gscsal@gscsal.com

Logo GSC
cropped-logo_gsc.png
Logo GSC

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

FILTERS

Filtered (2)
Filters
Type
Matrix
Preferred Use
Show (2)
Cancel

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)

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)

btn-scroll-form
91 551 92 52  –  gscsal@gscsal.com