Sampling of viscous materials for quantitative analysis requires transmission or transflectance sampling with a controlled pathlength. Variation in pathlength will prevent repeatable prediction of concentrations from sample to sample. Controlling the pathlength of a liquid generally means injecting it into a rigid container such as a cuvette. For viscous materials, this is tedious and difficult task, resulting in an analysis that becomes slow and expensive.
The VLS configured for quantitative transflectance sampling is shown in the above photo. After sampling, the sample can be thrown away, eliminating the need for filling or cleaning cuvettes or other sampling containers.
The Viscous Liquid Sampler avoids these problems by allowing samples to be filled into a disposable polymer bag that can be simply thrown away after analysis. The device allows repeatable quantitative sampling by closing a lever that sets the pathlength. Two versions are available: transflectance, which works in conjunction with the Antaris integrating sphere, and transmission, using the Antaris Tablet/Solids Transmission detector module. Each version comes with a set of three fixed pathlength levers, so you can determine the best pathlength for your samples.
Very short pathlengths are available, so quantitative work on aqueous or other highly absorbing materials is possible without the problems of highly absorbing spectral bands that can interfere with reliable quantitative predictions. The following absolute pathlengths are available:
Transmission: .5, 1, and 2 mm
Transflectance: 1, 2, and 4 mm
0 Items 
