Traces of toxic, man-made hexachlorohexanes in North Sea sediments were extracted by a
Chapter 4, Problem 4-F(choose chapter or problem)
Traces of toxic, man-made hexachlorohexanes in North Sea sediments were extracted by a known process and by two new procedures, and measured by chromatography. Concentration Standard Number of Method found (pg/g) deviation (pg/g) replications Conventional 34.4 3.6 6 Procedure A 42.9 1.2 6 Procedure B 51.1 4.6 6 SOURCE: D. Sterzenbach, B. W. Wenclawiak, and V. Weigelt, Anal. Chem. 1997, 69, 831. (a) Are the concentrations parts per million, parts per billion, or something else? (b) Is the standard deviation for procedure B significantly different from that of the conventional procedure? (c) Is the mean concentration found by procedure B significantly different from that of the conventional procedure? (d) Answer the same two questions as parts (b) and (c) to compare procedure A to the conventional procedure.
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