The Microchemical Laboratory of the Biochemical Research Foundation

Table Suitable for Mounting Microchemical Balance

“…Accurate results are attainable with this method if care is taken to oxidize the trace impurities present. In previous work on ceric oxidimetry the effect of trace impurities has not been evident, largely because the sensitive end-point procedure of Cooke and others (2) has been applied (4,7,8). Any reagent blank is eliminated in this method by the initial generation of ceric ion to the preset end-point potential as determined by a semimicro potentiometric titration.…”

“…Under exceptionally favorable circumstances significant results majr be obtained in the submicrogram range, as in the titration of permanganate with ferrous ion (IS). Contributing factors which tend to limit the lowest range for any particular method appear to be (1) unfavorable reaction kinetics, (2) trace impurities in reagents, and (3) possible consumption of the oxidant to form the initial oxide layer on the inert generating electrode or reduction of this oxide layer by the reductant.…”

“…In analytical chemistry, iron(II)-EDTA has been used for determinations of iodine ( 7), silver (6), and copper (2).…”

Systematic Qualitative Organic Microanalysis

“…The Clerici solutions mentioned in Table II served as manometer liquids in biological investigations conducted by K. A. C. Elliott (7) of this laboratory. During an experiment, crystals appeared in the manometer liquids; errors in the manometric determinations were probably caused by changes in the specific gravity.…”