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This article in JEQ

  1. Vol. 2 No. 3, p. 395-396
    Received: Sept 22, 1972



Reducing Mercury Pollution from Kjeldahl Determination of Total Nitrogen1

  1. H. M. Worsham and
  2. B. G. Blackmon2



Mercury as a digestion catalyst in Kjeldahl determination of nitrogen in soil and plant tissue is a potential pollutant if washed into laboratory drains. In an effort to reduce this pollution hazard, a study was conducted to develop a means of freeing Kjeldahl waste solutions of mercury. By using an inexpensive polyethylene trap, developed in our laboratory, and increasing the quantity of zinc in the distillation phase of the Kjeldahl procedure, more than 90% of the mercury was recovered and retained in the laboratory.

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