* Paleoecological analysis
* Deep water sediments
* Benthic community analysis

Gravity Corer
Unit Includes:
-core head with release mechanism;
Delrin® and stainless steel construction; rubberball is held in the open or "free-flushing" position by a release pin during penetration thus preventing
frontal wave disturbance of sediments
-bronze messenger;
300 gm; actuates release
of ball (under tension from a latex band) and
sealing of core head; vaccuum seal retaines
sediments in core tube during retrieval
-ballast;
plastic coated carbon steel weights (10
kg) slip tightly over core head to provide easy
adjustment of corer weight.
-polycarbonate core tube;7.5 cm I.D., 1.6
mm or 3 mm wall thickness x 125 cm length; virtually unbreakable; chamfered cutting edge; 1.0 cm scribe marks; polyethylene tube caps for safe transportation of intact cores
Slide-Hammer Corer
Unit Includes:
-core tube; same as described above for Gravity Corers.
-slide-hammer assembly; aluminum, bronze, and stainless steel construction; bronze hammer slides freely on a stainless steel rod (2.5 cm diam.,
75 cm length); weight can be hoisted upwards and dropped to force corer through harder substrates.
-corer head; same as described above for Gravity Corers.
Options:
-custom core tube diameters and lengths -additional ballast -core extruding apparatus -custom modifications
Citations:
Blomqvist, S., 1991. Quantitative sampling of soft bottom sediments: problems and solutions. Mar. Ecol. Prog. Ser., 72:295-304. Aaby, B., Digerfeldt, G. 1986. Sampling techniques for lakes and bogs. In: Berglund, B.E. (ed.) Handbook of Holocen Paleoecology and Paleohydrology. John Wiley & Sons, Chichester, pp. 181-194. Downing, J.A. 1984. Sampling the benthos in standing waters. In: Downing, J.A., Rigler, F.H. (eds) A Manual on Methods for the Assesment of Secondary Production in Fresh Waters, 2nd edn. IBP handbook No.17. Blackwell Scientific Publications, Oxford, pp. 87-130.

 

Mvc-003f.jpg (110939 bytes) Mvc-004f.jpg (93742 bytes)

GRAVITY CORER: Polyethylene, polycarbonate and stainless steel construction, rubber ball-type core retainer w/ latex band, simple-all angle-release mechanism, solid bronze messenger (400 gm), 10m x 10mm diam. polyester lowering line, linereel, three bronze gravity weights (4 kg ea, five ea. max. capacity), one-ea. thin-walled-clear polycarbonate core barrel (68 mm x 71 mm x 60 cm), core extruding plug, poly end caps, spares, toolbox carry case, hexdriver, complete: $595.00

bullet

Clear polycarbonate core barrel with poly end caps: 68 mm x 71 mm x 60 cm: $25

bullet

Clear polycarbonate core barrel with poly end caps: 68 mm x 71 mm x 120 cm: $45

Notes: Sample disturbance and compression are minimized by the thin-walled, free flushing core barrels. Ball-type seal held in the open position during deployment, which ensures good flushing.  Sediments are retained in the core barrel by a vacuum created by an excellent ball seal, not core-catchers. Upon retrieval, one must plug the bottom of the core tube before breaking the air-water interface (with core extruding plug or poly end cap) to prevent loss of sample.  Clear polycarbonate core barrel material readily available at most plastic distributors.  Core extruding plugs allow one to incrementally extrude sediments upward with aid of a Core Extruding Apparatus.  Core barrels can easily be drilled/plugged (for pore water extraction), serrated, cut and split to meet the special needs of the investigation.

Return to ARI Home Page

© Aquatic Research Instruments