Organic fractionation

150

ABSTRACTS Organic

Title: Analytical Authors: J. C. Journal: Anal. When controls niques perfected, tions of 15 to 50

Fractionation

distillation in miniature columns Winters and R. A. I)inerst,ein Cheer. 27 (4-I), 546-50 (1955) are made precise, instruments calibrated accurately, and tcchminiature fractional distillation columns give excellent separaml. samples wmparablc tjo high-efficiency macro units.

Microanalysis

with Tracer

Elements

and of Radioactive

Title: Ampoule combustion isotope dilution technique Authors: S. 1,. Jones and N. R. TrenneI Journal: ~lnal. Chem. 28, 38i-90 (1956) Method gives precision comparable to micro-l>umas samples sizes u-e11under 1 mg.

Elements

for organic

nitrogen

dctcrmination

but

with

Title: Ijetermination of trace elemrnt,s in titanium Authors: W. ,4. Brooksbank, Jr., G. W. Leddicotte, and S. A. Reynolds Journal: A&. Chunk. 28, 1033-35 (1956) Method employs neutron activat,ion analysis for microgram and submicrogram concentrations. Title: Isolat,ion and measurement of uranium at the microgram Iwo1 -4uthors: C. I,. Rulfs, A. K. De, and 1’. J. I<:lving Journal: Anal. Chem. 28, 1139 (1956) A double cupferron separation has bwn adapted for separating uranium on the micro level. Uranium(V1) does not extract in t,he first stage, which removes Uranium(V1) obtained in the residual many potentially interfering elcmrnts. aqueous solution is extract,ed as the cupferrate into ether, then re-extracted into nitric acid. Title: Automatic oxidimrtric mirromethod for uranium Author: K. A. Allen Journal: .3nal. (‘hem. 28, So. 7, 1144 (1956) -4 method has been developed which IIWS a chemical and mechanical system for the rapid and convenient determination of 10 to 100 gamma quant,ities of uranillm. Microliter amounts of standard ceric sulfate are automatically dclivered to reduced sample solrttions and the volrlmcs are recorded on the chart of a recording potentiomctw. Tit,le: Ijet. of traces of boron with two new calorimetric reagents Aut,hors: R. Grob and J. Yoe Journal: Anal. Chit,/. Acfa 14 (3), 253 (1956) and S-p-tolltidinoI, 1 ‘5-Benzamido-8’-chloro-I, 1 ‘-bis( :tnthrayllillollvI)amine Complex formation depends on time bis(anthraquinonyl)amine in cont. H$Oa. of heating, temp., H,SOr content. Xl&hod for B in leaves and alfalfa. hfICROCHEMIChL

JOURKAL,

VOL.

I, ISSUE

1