Rosette sampler


A rosette sampler is a device used for water sampling in deep water in order to investigate about its quality.

Description

A rosette sampler is made of an assembly of 12 to 36 sampling bottles. Each bottle is a volume that range from a minimum value of 1.2 L to a maximum value of 30 L. All of them constitutes the rosette sampler and are clustered around a cylinder situated in the center of the assembly, where there is a sensing system called Sea-Bird or CTD, that stands for "Conductivity, Temperature and Depth", although other variables can be measured by modern CTDs.
The apparatus is attached to a wire rope. A winch on board of the boat unroll the rope during descent and roll up it during the ascent. During operations in the ocean, a rosette sampler can approach the seabed at a distance from 1 to 5 m, depending on the particular sea conditions.
The opening of each sampling bottle can be automatic or manual.

Applications

Water sampling is used in general for chemical analysis and ecotoxicological assessment.
A rosette sampler is preferred to Winchester sampler for collection of water sampling at depths greater than 50 m.