Proposed New Electrolytic Conductivity Primary Standards for KCl Solutions.
An absolute determination of aqueous electrolytic conductivity has been made for 0.01 molal (m) and 0.1mpotassium cliloride solutions, over the temperature range of 0 to 50 °C in 5 degree intervals. A cell with a removable center section of accurately known length and area was used for the measurements. Values were adjusted to be in conformity with the ITS-90 temperature scale. The overall uncertainty over the entire temperature range is estimated to be 0.03%. Values at 25 °C for 0.01 and 0.1mare 0.00140823 and 0.0128246 S/cm, respectively. It is proposed that these values be adopted as primary standards for aqueous electrolytic conductivity, replacing the demal scale.
National Institute of Standards and Technology, Gaithersburg, MD 20899.
Y C
YC
Wu
National Institute of Standards and Technology, Gaithersburg, MD 20899.
W F
WF
Koch
National Institute of Standards and Technology, Gaithersburg, MD 20899.
K W
KW
Pratt
cell constant; conductance; demal; electrolytic conductivity; molal; potassium chloride; primary standards; resistance; specific conductance