Proposed New Electrolytic Conductivity Primary Standards for KCl Solutions
نویسندگان
چکیده
An absolute determination of aqueous electrolytic conductivity has been made for 0.01 molal (m) and 0.1 m potassium 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 0.1 m are 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.
منابع مشابه
Stability of Standard Electrolytic Conductivity Solutions in Glass Containers
The stability of solutions having an electrolytic conductivity, κ , of 5 μS/cm to 100 000 μS/cm packaged in glass screw-cap bottles, glass serum bottles, and glass ampoules was monitored for 1 year to 2 years. The conductivity was determined by measuring the ac resistance of the solution. Mass loss was also monitored for solutions packaged in bottles. The solutions were prepared using KCl in wa...
متن کاملLow Electrolytic Conductivity Standards
Standards of low electrolytic conductivity were developed to satisfy the demands of the U.S. Navy and American industry for the measurement of high quality water. The criteria for the selection of appropriate solvent and solutes, based on the principles of equivalent conductivity and Onsager's limiting law, are described. Dilute solutions of potassium chloride and benzoic acid in 30 % n-propano...
متن کاملA dc Method for the Absolute Determination of Conductivities of the Primary Standard
National Office of Measures, Budapest, Hungaiy A new method for the absolute determination of electrolytic Conductivity based on direct current and potcntiomctrlc measurements is described. The unique design of the cell uses a removable center section whose length and crosS'Seciional area arc accurately known. Two pairs of matched Ag, AgCI electrodes are used in a four terminal mode of resistan...
متن کاملConductivity-Dependent Flow Field-Flow Fractionation of Fulvic and Humic Acid Aggregates
Fulvic (FAs) and humic acids (HAs) are chemically fascinating. In water, they have a strong propensity to aggregate, but this research reveals that tendency is regulated by ionic strength. In the environment, conductivity extremes occur naturally—freshwater to seawater—warranting consideration at low and high values. The flow field flow fractionation (flow FFF) of FAs and HAs is observed to be ...
متن کاملThin-film electrochemical sensor electrode for rapid evaluation of electrolytic conductivity, cyclic voltammetry, and temperature measurements
A thin-film electrochemical sensor electrode capable of electrolytic conductivity, cyclic voltammetry, and temperature measurements of electrolyte solutions has been fabricated and characterized. The electrode fabrication and calibration is detailed, showing accuracies of 6 % for electrolytic conductivity measurements over the range of 0.1–100 mS cm 1 and temperature measurement within 2 C from...
متن کامل