D.4.3 Collection and preservation of column leachate samples for total metal, chloride ion, total organic carbon, pH, and electrical conductivity analyses

j. Weigh the 5,000-mL beaker, spatula, and scoop. Use the scoop to

transfer approximately 4 kg of sediment to the beaker. Record the total

weight of the sediment, beaker, spatula, and scoop.

k. Slowly fill the sediment chamber with sediment from the beaker, while

carefully avoiding entrapment of air bubbles. When the sediment is

level with the top part of the sediment chamber, carefully smooth the

surface of the sediment with the spatula. (Note: In order to properly

seat the top distribution plate, clean the groove in the sediment

chamber.)

l. Place a distribution plate on top of the sediment chamber. Place a glass

fiber filter on top of the distribution plate. Wet the O-ring before

placing it in the top groove of the sediment chamber.

m. Carefully place the top plate on the sediment chamber, aligning the plate

with the threaded rods in the base plate. Tighten all nuts. Connect -in.

stainless steel tubing to the outlet of the top plate.

n. Connect a suitable length of stainless steel, or teflon tubing to the outlet

of the top plate. (Teflon is recommended for leaching of metals.)

o. Set the dial indicator to obtain the correct flow rate for experimental

conditions. Turn on the fluid pump, carefully check all areas for leaks,

and tighten connections if necessary.

p. Reweigh the beaker, spatula, scoop, and sediment remaining in the

beaker. Determine the weight of sediment in the column leach

apparatus, by difference, and record this weight.

D.4.3 Collection and preservation of column leachate samples for

total metal, chloride ion, total organic carbon, pH, and electrical

conductivity analyses

This procedure describes the collection and preservation of samples

generated from leaching of sediment and dredged material in laboratory column

leaching apparatus. Column leachate samples are collected at a prescribed

frequency, preserved with acid to pH < 2, and stored at 4 EC prior to metals,

chloride ion, and total organic carbon (TOC) analyses. The pH and electrical

conductivity are determined on discrete nonacidified samples.

A. Sampling and preservation materials.

Analytical balance

pH paper

Parafilm, minimum 4 in. in width

D16

Appendix D Leachate Testing Procedures