Benzenes organic trace analysis

In Table 1.3.2 a method for the analysis of nitrates and nitrites for a wide variety of samples is given Aqueous nitrate ions are converted to nitrobenzene by reaction with benzene in the presence of concentrated sulfuric acid as catalyst. The special methods for the different materials are described. To stabilize samples against bacterial action, which can reduce nitrate concentrations, phenylmercuric acetate is added after collection ° Other inorganic compounds in the trace levels for gas-chromatographic determination are, for example, water and carbon monoxide, which were determined in organic solvents or air in the ppb-range ... 

Figure 9.9 shows the distribution of lutetium (using trace concentrations of "Lu, (jS y ti 6.71 d) between an aqueous solution and benzene containing an organic complex former (HA = acetylacetone). Eqn. (9.23.a) has been Etted to the experimental points by regression analysis to yield the equilibrium constants, by which the solid curves have been calculated. 

Some simple organic species. Precipitated sulfur, as obtained during analysis when HCl is added to a polysulfide extract of metallic sulfides, is soluble in benzene or low-boiling petroleum ether. This has value when looking for traces of As or Sb sulfides. 

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