46
Phenolics–1
sample tube using a downward, twisting motion as opposed to
a sideways motion. Remove the sample tube within 4 seconds
of removing it from the block or suck-back of the sample will
occur. Dispose of the sample tube and the hot solution left in it
by dropping it into the sink or waste bucket.
12. Invert each collector tube and place it into the collector tube
rack, with the
D end up. It should take less than two minutes to
pull and separate all 21 tubes.
13. Parafilm the
M end and allow tubes to cool for at least 10
minutes.
14. For each collector tube, hold the tube horizontally and rinse its
walls with the distillate in order to homogenize it. Slowly roll the
distillate around in the tube to gather all droplets clinging to the
tube walls into the bulk of the distillate. Then, slowly return the
collector tube to an upright position so that the
D end is up.
Stubborn drops will often fall into the
M end when the tube is
flicked with a finger.
15. With the
D end still up, break the collector tube in half by pulling
the
D end hard towards the user to break it, then twisting and
tearing off the
D end. Discard the D end.
16. In the remaining
M end of the collector tube, dilute to the 6.0 mL
mark with deionized water.
17. Shake the tube with a gentle whipping motion to mix in diluent
water. Do not invert the sample. With the
M end down, place
the tube into the collector tube rack.
18. Determine the solution in the tube with Lachat's QuikChem
Method 10–210–00–1–A, B, D, Y or equivalent. There is
enough distillate for two 25 second sample periods. Seal both
ends with Parafilm if the sample will not be determined
immediately.
12.2 Sources
• U.S. Environmental Protection Agency, Methods for the
Determination of Inorganic Substances in Environmental
Samples, Method 420.4. EPA/600/R–93/100, Revised
August 1993.
• U.S. Environmental Protection Agency, Test Methods for
Evaluating Solid Waste, Physical / Chemical Methods
(SW–846), Method 9065, Revision 0, September 1986,
“Phenolics.”
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