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Applications
Disturbed sediment sampling
Specifications
Maximum sample depth: > 30 m
Sampling volume (maximum): 0.5l
Sample specification: Disturbed
Type of sample: Loose material
Sediment type: Soft/medium
Profile description: No
Suitable for use in flowing water: Flow rate of max. 0.2 m/sec
Usable in situations in which the pores are not filled with water (such as powders): Yes
Operation: Manually or with davit
Weight of the set: 2 - 41 kg
Description
Easily collect samples at the bottom of lakes, rivers with the Van Veen grab. Simply open the jaws and take a ‘grab’ when reaching the bottom. When hoisting the rope up again the jaws will shut tight and the sample is taken. The Van Veen gab will give you a fast indication of the sediment type and is available in four different sizes. The stainless steel construction ensures that the Van Veen grab is strong and of high quality.
Method
The mode of operation of all Van Veen grabs is the same. At the surface the jaws are pushed open and kept in that position by a hook. To keep the hook in the right position the Van Veen grab should be sunk at a steady, not too high, pace. Both jaws are fitted with holes to allow air to escape during the sinking. If these holes were not there, the air would escape when taking the sample, which would result in interference with the sample. As soon as the jaws touch the bottom, the hook loosens its grip, so that, when hoisting the rope again the jaws will shut tight because of the leverage by the rods.
It is recommended to take at least 6 samples from every location and to base your conclusion on the total of the samples. This is especially important when the bottom is less regularly shaped and the bottom material consists of a mixture of materials.
Variations
04.30.01 0.5 litres, 126 cm²
04.30.02 2 litres, 260 cm²
04.30.03 6 litres, 480 cm²
04.30.05 12 litres, 800 cm²
Manual
