This method is used for the determination of color in water and wastewater. The standard range is 10 to 250 units although other ranges are applicable.
Samples are mixed with a phosphate buffer at pH 6.8. The absorbance of this solution is measured at 410 nm and is directly proportional to the color.
Turbid samples will produce a positive bias even with slight turbidity. Samples may need to be centrifuged or filtered.
|Flow System||A235||10-250 units|
|Astoria 2||A235||10-250 units|