H. D. Nelson

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.^[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.^[ref]

An invented instrument calibration example illustrates why a detector reading is not itself a concentration. Suppose peak area obeys $A=A_0+sc$, with blank area $A_0=20$, response slope $s=10$ area units per $\mu \mathrm{mol}{\mathrm{L}}^{-1}$, and sample area $A=200$. Then $c=(200-20)/10=18\mu \mathrm{mol}{\mathrm{L}}^{-1}$. 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.