Page 182 - Demo

180
Environmental Science
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Bottom Sampling Dredge AP5059
Environmental Science— Water Sampling, continued
Bottom Sampling Dredge
Collect any soft bottom sediment—sand, mud, silt, gravel—with this convenient and easy-to-use bottom sampling dredge. Simply lower the sampler over a select area, lift the bridle, and watch the jaws close in scissor-like fashion to retrieve a volume of sediment. The sturdy stainless steel sampler has a trigger to hold the sampler open during lowering and a strong rope connecting the two arms. The sample, if released carefully, can be analyzed as it appeared on the bottom. Chamber size 71⁄2" L x 3" W x 3" H. Sample size 68 in3.
Meters, pH See pages 513–516.
Dissolved Oxygen Meter
One-hand simple operation with automatic temperature compensation and calibration to air makes this pen meter excellent for environmental field work. Allows students to determine water quality for a variety of real-life applications, such as general environmental testing, labs, industrial and municipal testing, aquariums, fish hatcheries and much more.
Features include:
• A range of 0–20.0 mg/L; 0–100%
• A resolution of 0.1 mg/L; 0.1%
• An accuracy of ±0.4 mg/L; ±0.7%
• A temperature range of 32–122 °F; 0–50 °C
• Simultaneous display of dissolved oxygen and temperature readings
• Ability to hold readings and recall min/max
Polarographic probe has a built-in temperature sensor and easy-to- replace pop-off probe heads. Meter is IP-65 waterproof and comes ready to use in a soft carrying case with a belt loop, two spare probe heads, electrolyte and 4 AAA batteries. 8" x 2" x 11⁄2".
Plankton Net
High-quality conical net of fine mesh, 153-micron nylon fabric. A clear, graduated collecting tube is attached to the end of the net to facilitate handling and transferring collected plankton. The net mouth is held open by a stainless steel ring that will not rust or corrode. A three-line harness attaches the net to the tow line and ensures that proper orienta- tion is maintained during use. Net measures 5" D x 15" L, and includes a spare collecting tube.
Secchi Disk
A relative estimate of the phosphate concentration of a lake can be made using a Secchi disk to determine water clarity. The disk is lowered into the water and the depth at which it is no longer visible is recorded. Light extinction depth is determined and helps to estimate the micro- scopic plant and animal life supported by the water. This standard 20 cm diameter limnological disk is black and white on one side, white on the other, and constructed of durable ABS plastic. Supplied with integral weight and 48' (15 m) of 1⁄8" nylon cord.
Dissolved Oxygen Meter FB2008
Catalog No.
Description
Price/Each
AP5059
Bottom Sampling Dredge
$253.85
Catalog No.
Description
Price/Each
FB2008
Dissolved Oxygen Meter
$299.25
Plankton Net FB0566
Catalog No.
Description
Price/Each
FB0566
Plankton Net
$109.00
Secchi Disk AP7175
Catalog No.
Description
Price/Each
AP7175
Secchi Disk
$64.30
ENVIRONMENTAL SCIENCE—WATER SAMPLING continued on next page.
Use a Secchi Disk to Determine Turbidity
1. Lower the Secchi disk into the water until it just disappears. Read the water depth from the calibrated line.
2. Raise the Secchi disk until it just appears. Read the water depth from the calibrated line.
3. Add readings from steps 1 and 2 and divide by 2. Record the Secchi Disk Transparency in meters.
Readings from a drainage lake—more plankton, silt and organic matter so less transparent—may be 1.0–1.4 meters. Readings from a seepage lake—more transparent—may be 3.0–4.0 meters. Readings as high as 19–21 meters would indicate extreme clarity. Clarity decreases in summer so that same lake may read only 10 meters during the summer.