Proficiency tests for environmental and water laboratories.

Spring 2019

Registration opens in January. Information will be sent by email.


Suspended solids + Sludge

Total suspended solids, Fixed ignition residue, Coarse particles (part B only)
If there is enough interest: solids and ignition on evaporation (SS 028113) in part A

Part A: Municipal wastewater, treated
Part B: Paper industry wastewater, treated

Dry weight, Fixed ignition residue, pH, alkalinity, ammonium nitrogen

Part C: Digested sludge, wet

  • Dispatch: February 4
  • Analysis: February 7
  • Reporting deadline: February 27


Metals and trace elements

Al, Ag, As, B, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Sb, Se, Si, Sn, Sr, U, V, Zn

Part A: Potable water, spiked
Part B: Municipal wastewater, spiked

  • Dispatch: March 11
  • Analysis (Hg): March 14
  • Analysis (others): day of choice
  • Reporting deadline: April 3


Nutrients + low pH

NO2-N, NO3-N, NO23-N, NH4-N, Ntot, PO4-P, Ptot, Si, colour (Hazen), pH, conductivity
If there is enough interest: BOD & susp in part A

Part A: Eutrophic recipient
Part B: Municipal wastewater, treated

Part C: Synthetic solution for low pH, provided to all participants

  • Dispatch: April 8
  • Analysis: April 11
  • Reporting deadline: May 2

Autumn 2019


Ion Balance

Colour (Hazen), colour (absorbance), conductivity, pH, turbidity, alkalinity, Ca+Mg, hardness (dH), Ca, K, Mg, Na, chloride, fluoride, sulphate, CODMn, TOC

Part A: Potable water
Part B: Lake water

  • Dispatch: September 2
  • Analysis: September 5
  • Reporting deadline: September 25



BOD7, CODCr, CODMn, TOC, Na, Conductivity, pH, Alkalinity

Part A: Municipal wastewater, treated

BOD7, CODCr, TOC, Na, Conductivity, pH, Alkalinity, Ntot, Ptot

Part B: Paper industry wastewater, treated

  • Dispatch: in September
  • More information later.

Proficiency Tests 2019

Information och program (pdf)

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