AXIO | Proficiency Testing schemes 2026
Rounds per Year
Sample Code Matrix
Analytes
PT-AQ-01A Higher salinity water
Sodium; Magnesium; Chloride; Sulfate; pH at 20- 25°C; Conductivity (20°C); Total Organic Carbon (TOC); Total Dissolved Solids 5
PT-AQ-01H Hard water (surface/groundwater)
Calcium; Magnesium; Total Hardness; Alkalinity; Potassium; Sodium; Chloride; Sulfate; Fluoride; Conductivity (20°C); Kjeldahl Nitrogen; Total Phosphorus; Barium Calcium; Magnesium; Total Hardness; Alkalinity; Potassium; Sodium; Chloride; Sulfate; Fluoride; Conductivity (20°C); Kjeldahl Nitrogen; Total Phosphorus; Barium Calcium; Magnesium; Total Hardness; Alkalinity; Potassium; Sodium; Chloride; Sulfate; Fluoride; Conductivity (20°C); Kjeldahl Nitrogen; Total Phosphorus; Barium Calcium; Magnesium; Total Hardness; Alkalinity; Potassium; Sodium; Chloride; Sulfate; Fluoride; Conductivity (20°C); Kjeldahl Nitrogen; Total Phosphorus; Barium pH at 20-25°C – Low; pH at 20-25°C – High Total Oxidised Nitrogen (TON); Silicate; Nitrite; Ammonia; Soluble Reactive Phosphorus (PO4); pH at 20-25°C; Conductivity (20°C); Colour; Permanganate Index (PI); Total Cyanide; Free Cyanide; Nitrate; Total Dissolved Solids; Colour ISO 7887 Total Oxidised Nitrogen (TON); Silicate; Nitrite; Ammonia; Soluble Reactive Phosphorus (PO4); pH at 20-25°C; Conductivity (20°C); Colour; Permanganate Index (PI); Total Cyanide; Free Cyanide; Nitrate; Total Dissolved Solids
5
PT-AQ-1HP
Hard water (treated potable water)
2
PT-AQ-01S Soft water (surface/groundwater)
5
PT-AQ-1SP
Soft water (treated potable water)
2
PT-AQ-02A Poorly Buffered Waters
3 5
PT-AQ-02H Hard water (surface/groundwater)
PT-AQ-2HP Hard water (treated potable water)
2
PT-AQ-02S Soft water (surface/groundwater)
Total Oxidised Nitrogen (TON); Silicate; Nitrite; Ammonia; Soluble Reactive Phosphorus (PO4); pH at 20-25°C; Conductivity (20°C); Colour; Permanganate Index (PI); Total Cyanide; Free Cyanide; Nitrate; Total Dissolved Solids; Colour ISO 7887 5 Total Oxidised Nitrogen (TON); Silicate; Nitrite; Ammonia; Soluble Reactive Phosphorus (PO4); pH at 20-25°C; Conductivity (20°C); Colour; Permanganate Index (PI); Total Cyanide; Free Cyanide; Nitrate; Total Dissolved Solids 2
PT-AQ-2SP
Soft water (treated potable water)
PT-AQ-03
Spiking solution
BOD (5 day); COD; Suspended solids; Methylene blue active substances (MBAS); Non-ionic surfactants; Dissolved organic carbon; Turbidity Bromide; Bromate; Chlorate (low level); Chlorite (low level); Chlorate (high level); Chlorite (high level) Free Chlorine (at typical potable levels – see AQUACHECK scheme description for further details)
5
PT-AQ-03A Spiking solution
5
PT-AQ-03B Clean water
5
PT-AQ-03C Clean water
Total Chlorine (at typical potable levels - see AQUACHECK scheme description for further details) 5 Metals: Iron; Manganese; Copper; Aluminium; Zinc; Silver; Barium; Boron; Strontium; Lithium 5
PT-AQ-04
Surface water
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