UV and NIR Spectra of Commercial Mineral Water Samples and Quantitation of Mineral Water Sample Mixtures by Multiple Linear Regression

Introduction

Mineral water, consisting of raw water from naturally occurring springs or sources, is now available under many commercial labels. The mineral content in these different brands of water not surprisingly differs depending on their source. Here we investigated these mineral content differences using absorption spectra obtained from measurement of using an ultraviolet, near infrared spectrophotometer. Since the differences in the absorption spectra cannot be seen in the visible region due to the transparency of mineral water, the investigation was conducted in the ultraviolet and near infrared regions. These days, chemometrics is often used for simultaneous quantitation of multiple constituents. An example of the effectiveness of chemometrics quantitation is presented here, in which we applied multiple linear regression to determine the mixture ratios of several commercial mineral water samples.

March 14, 2013 GMT