Nitrate Analysis of Water Samples Using a Benchtop UV-vis Spectrophotometer

December 14, 2016

The EPA has established a maximum contaminant level of nitrate-nitrogen in potable water of 10ppm. This application presents results of UV-Vis analysis of nitrate concentrations in water samples, showing that the manual colorimetric method is suitable for analysis of nitrate contamination in water systems.

Variable Angle Reflectance and Transmittance of Thin Film Coatings Using UV-Vis-NIR

June 08, 2016

The ability to easily characterize thin films by variable angle transmission and reflection is very important in both the design/development process and in the final production. This note presents the use of UV-Vis-NIR spectroscopy to characterize film samples in the full spectral region, from UV to NIR.

Analysis of Highly Mineralized Aqueous Solutions by ICP-AES

May 13, 2016

EPA methods 200.7 and 6010 specify ICP; however, analysis of the major components may involve dilution of off-scale peaks, making the analysis more difficult. This work demonstrates a method that uses low-sensitivity analytical lines for the high-concentration major components and high-sensitivity analytical lines for the low-concentration trace components. This eliminates the need for multiple dilutions to get major elements on-scale.

Absolute Total Reflectance Spectra of Very Small Objects using an Integrating Sphere

January 12, 2016

Correct positioning of very small samples to acquire accurate spectra can be very challenging. This application note demonstrates an easy-to-fabricate holder that is suitable for many small samples, and shows the measurement of absolute total reflectance using this sample holder.