- Method ASTM D1688
- Repeatability variable, see method
- Reproducibility variable, see method
- Blending linear
- Additive Correction No
Copper enters water supplies through the natural process of dissolution of minerals, through industrial effluents, through its use, as copper sulfate, to control biological growth in some reservoirs and distribution systems, and through corrosion of copper alloy water pipes. Industries whose wastewaters may contain significant concentrations of copper include mining, ammunition production, and most metal plating and finishing operations. It may occur in simple ionic form or in one of many complexes with such groups as cyanide, chloride, ammonia, or organic ligands.
Although its salts, particularly copper sulfate, inhibit biological growth such as some algae and bacteria, copper is considered essential to human nutrition and is not considered a toxic chemical at concentrations normally found in water supplies.
Since Ethanol has a tendency to absorb water and moisture copper is included as a test in the D4806 fuel ethanol specifications.
This method is run by aspirating standards and sample through an Atomic Absorption Spectrophotometer. The instrument burns the sample or standard and reads the light coming off of the flame in a specific wavelength depending upon the element and will give the user a result basis this.