Systematic absorbance errors with technicon autoanalyzer II colorimeters
Document Type
Article
Date of Original Version
1-1-1978
Abstract
Technicon AutoAnalyzer II colorimeters have spectrophotometric flowcells with curved optical ends. Light passing through these flowcells is refracted severely at the non-perpendicular ends. Curved ends therefore cause differences in apparent absorbance measured at the phototube which are related to differences in the refractive indices of the solutions in the cells. This can cause significant error in the colorimetric analysis of solutions with different refractive indices (caused, for example, by variations in salinity). This effect is responsible for a systematic error which, for typical AutoAnalyzer determinations of phosphate in seawater or estuarine waters, can approximate 0.2 μM. © 1978.
Publication Title, e.g., Journal
Water Research
Volume
12
Issue
8
Citation/Publisher Attribution
Froelich, Philip N., and Michael E. Pilson. "Systematic absorbance errors with technicon autoanalyzer II colorimeters." Water Research 12, 8 (1978). doi: 10.1016/0043-1354(78)90139-2.