BALTIC SEA ENVIRONMENT PROCEEDINGS No. 80

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Sampling device: STUK CorerType of corer: a gravity corer with a thick stainless-steel body and an inner Plexiglas coring tubeTotal length: 55 cmTotal weight: 12.5 kgClosing mechanism: spring-operated bottom valve released by a messenger weightTube length: 50 cmInner diameter of coring tube: 64 mmSampled area: 32.2 cm 2Number of parallel samples/analysis: 3Sectioning device: an extruder piston and simple Plexiglas slicing units with sliding cutting platesSectioning intervals: 2 or 5 cmDescribed in: Klemola et al., 1991.18
SOME NOTES ON SAMPLING ON BOARD THE ARANDA<strong>No</strong>tes of this kind were available only from the Aranda. The sampling programme usually took oneday at each station. The weather conditions were quite favourable for sampling. At stations BY-15 andTeili-1 the wind speed was about 10 m s -1 and the swell was moderate. At station EB-1 the wind speed(about 12 m s -1 ) and the waves were slightly higher. The ship was kept firmly in place the whole day,but the waves might have influenced the sampling somewhat. At station XV-1 the wind was light andthe waves were low.There were some clear differences in the sampling procedures. The Sprut Corer was allowed to fall ata relatively high speed into the sediment, while the others (especially Aquarius, Gemini and STUK)were lowered very slowly and carefully when the corer was approaching the bottom. Secondly, in allthe samples other than those taken by the Sprut Corer, a wash bottle filled with local sea water wasused to rinse the sediment remains into the sample boxes from the slice holders or slicing rings. Thepurpose was to obtain total dry weight and radionuclide values for the unit of area.At each station the Aquarius Corer was operated without additional weights, but even so it was almostfilled up to the brim at station XV-1, where the sediment was extreme soft. From the two samplestaken with the Aquarius Corer at stations Teili-1 and XV-1, the second ones looked better visually (seeTables in Appendix). Nevertheless, all the samples taken by the Aquarius Corer during this surveywere of excellent quality. The sediment surface was undisturbed, straight and horizontal, without anysign of scavenging, smearing or tilting. The overlying water was clear and full of small benthicanimals, such as Monoporeia affinis, Mysis relicta and Harmothoë sarsi at stations EB-1 and Teili-1.The Gemini Corer was operated without additional weights, too. It was only used at stations BY-15and Teili-1, but all the samples looked fine, with minimal signs of smearing. The Niemistö Corer waschosen in advance as a reference corer in this exercise, so it was the most frequently used device. Itwas always operated with 3 additional weights (adding 10.5 kg). In general the samples looked fine,with an even surface and clear overlying water, but quite frequently the edges of the core seemed to beslightly detached from the wall of the coring tube, and clear signs of smearing could be seen. Thequality of the Swedish and Finnish samples taken by the Niemistö Corer was generally of the samestandard. However, the Swedish samples were sliced with a slicing ring (ref. Gemini Corer) and theFinnish samples with slice holders. Both teams used wash bottles and local sea water to rinse theslicing tools.The samples taken by the Sprut Corer appeared to be mixed immediately after sampling. The water onthe top of the sediment core was black due to disturbance of the surface sediments. However, thecoring tubes were allowed to stand for several hours (or overnight). The overlying water was thendecanted and filtered before slicing. The aim was to analyse the filters and to add these amounts to thesurface sediment results.The Selena and STUK Corers were tested only at station EB-1 and the Limnos sampler at station XV-1. The cores taken by the STUK Corer looked excellent and also those taken by the Selena Corer andLimnos Sampler were of good quality and fulfilled our quality requirements. Nevertheless, there wereminor difficulties in slicing of the first Limnos sample due to the very loose surface sediments.
Page 1: BALTIC SEA ENVIRONMENT PROCEEDINGSN
Page 4: For bibliographic purposes this doc
Page 7 and 8: INTRODUCTIONDuring the last four de
Page 9 and 10: B .EFig. 1. General sources of erro
Page 11 and 12: SAMPLING ARRANGEMENTS AND ANALYSESI
Page 13 and 14: Fig. 4. The MOSSIE 1992 research gr
Page 15 and 16: DESCRIPTION OF SAMPLING DEVICES AND
Page 17 and 18: Sampling device: Large Box Corer (B
Page 19 and 20: Sampling device: NIEMISTÖ Corer (S
Page 21 and 22: Sampling device: SELENA Corer (FIMR
Page 23: Sampling device: SPRUT Corer (CLOR
Page 27 and 28: Station Teili-1At station Teili-1 (
Page 29 and 30: 5) The corer that was nearest to th
Page 31 and 32: CHARACTERISTICS OF THE SAMPLING DEV
Page 33 and 34: The aim of each given study should
Page 35 and 36: REFERENCESAarkrog A. and Dahlgaard
Page 37 and 38: Figures6-19
Page 39 and 40: Fig. 7. Vertical profiles of Cs-134
Page 41 and 42: Fig. 9. Vertical profiles of G-134
Page 47 and 48: Dry w.H. conMaxMedNieDiff.0.630.560
Page 49 and 50: Dry w.H. conMoxMedNieFIN SelenoFIN
Page 51 and 52: Std Cs= Cs in min.dens. - Corer spe
Page 53 and 54: Table I. Results of Tukey’s test,
Page 55 and 56: Table III. Results of Tukey’s tes
Page 57 and 58: Table V. Results of Tukey's test, r
Page 59 and 60: APPENDIXAnalytical data
Page 61 and 62: Sampler: Small Box Corer DNumber of
Page 63 and 64: Sampler: Sprut Corer RUS (I) Number
Page 65 and 66: Sampler: Small Box Corer D Number o
Page 67 and 68: Sampler: Niemistö Corer D Number o
Page 69 and 70: Sampling station: XV-1Sampler: Aqua
Page 71 and 72: Sampler: Sprut Corer POL (I) Number
Page 73 and 74: Sampler: Niemistö Corer FIN Number
Page 75 and 76:
Sampler: Selena Corer FIN Number of
Page 77 and 78:
Sampler: Niemistö Corer D Number o
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No. 11No. 12No 13No. 14No. 15No 16A
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No. 32No. 33No. 34No. 35ANo. 35BNo.
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No. 59No. 60No. 61No. 62No. 63No. 6
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BALTIC SEA ENVIRONMENT PROCEEDINGS No. 80

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