= H. D. Nelson
{c}
\b[H. D. Nelson] is credited with <C. L. De Ligny> as an author of experimental hydrocarbon <solubility> measurements published in 1968. The NIST hexane/water record identifies their joint work as its original measurement source. The verified byline supports this contribution without supplying a fuller identity or an individual division of laboratory tasks.<Hexane with water in the IUPAC-NIST Solubility Database>[Record37_269, Original Measurements]{ref}
The recorded method equilibrates the liquid system, samples the aqueous solution with a microsyringe, and uses <gas chromatography> with flame-ionization detection. It addresses a quantitative question: how much <hexane> is dissolved in <water>, rather than simply whether two visible bulk liquid regions remain.<Hexane with water in the IUPAC-NIST Solubility Database>[Method/Apparatus/Procedure]{ref}
An invented <instrument calibration> example illustrates why a detector reading is not itself a concentration. Suppose peak area obeys $A=A_0+s c$, with blank area $A_0=20$, response slope $s=10$ area units per $\mu\mathrm{mol\,L^{-1}}$, and sample area $A=200$. Then $c=(200-20)/10=18\,\mu\mathrm{mol\,L^{-1}}$. These are teaching values, not measurements or calibration constants from Nelson and De Ligny's paper. The example separates equilibration, sampling and detector response, all of which matter when interpreting a small dissolved signal.
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