Bulk collector

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A bulk collector is a collection device for recording the deposition of sedimenting dry and wet particles ( bulk deposition ) from the atmosphere. In contrast to the wet-only collector , it is always open. The difference to the Bergerhoff device is that with the Bergerhoff method only the dry residue is recorded.

Structure and procedure

Bulk collectors consist of a collection unit, a holder for the collection unit and a contamination protection. Bottles, pots or cartridges, which can optionally be equipped with a funnel , are used as a collection unit . The arrangements of funnel and bottle usually resemble a meteorological precipitation gauge . The collection unit must be designed in such a way that changes to the samples due to light, chemical or biological processes are avoided. This is countered by darkening the sample container and choosing a suitable material. If required, the bulk collector can also be equipped with a cooling and heating unit. To ensure that as few gas components as possible are absorbed by the collection unit , the surfaces that can get wet during sampling must be kept small.

The collector opening should be at a height of one to two meters above the ground. Potential contamination of the collecting container with animals, bird droppings or leaves must be avoided. The free flow to the collecting container should be guaranteed.

During the actual sampling, dry and wet particles are collected, which can then be analyzed. In practice there is no complete collection of sedimenting particles.

literature

  • VDI 4320 Part 1: 2012-01 Measurement of atmospheric deposits; Sampling with bulk and wet-only samplers; Basics (Measurement of atmospheric depositions; Sampling with bulk and wet only collectors; General principles). Beuth Verlag, Berlin. ( Summary and table of contents online )

Individual evidence

  1. VDI 4320 sheet 2: 2012-01 Measurement of atmospheric deposition; Determination of the dust deposition according to the Bergerhoff method (Measurement of atmospheric depositions; Determination of the dust deposition according to the Bergerhoff method). Beuth Verlag, Berlin. P. 2.
  2. a b Ulrich Dämmgen, Elke Bieber, Frank Bunzel, Tilman Gocht, Dagmar Kallweit, Ralf Lumpp, Günter Noll, Peter Plegnière, Oliver Topp, Markus Wallasch: Measurement of Atmospheric Deposition - A first VDI guideline on fundamental questions when recording the deposition of sedimenting Particles. In: Hazardous substances - cleanliness. Air . 68, No. 10, 2008, ISSN  0949-8036 , pp. 441-444.
  3. Wet, dry and total deposition. Bavarian State Office for the Environment , accessed on June 16, 2016 .
  4. VDI 4320 sheet 1: 2012-01 Measurement of atmospheric deposition; Sampling with bulk and wet-only samplers; Basics (Measurement of atmospheric depositions; Sampling with bulk and wet only collectors; General principles). Beuth Verlag, Berlin. P. 3.