Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.

Issue 6, 2003
Previous Article Next Article

Preservation of sulfidic waters containing dissolved As(III)

Author affiliations


Solutions containing variable concentrations of sulfide (0 to 31 ppm) and arsenite (0.35 to 10 ppm) were subjected to several different preservation treatments. As predicted by equilibrium thermodynamics, at near-neutral pH the experimental solutions were undersaturated with respect to orpiment (As2S3). However, upon acidification to pH 2 with HCl or HNO3, instantaneous precipitation of poorly crystalline As2S3 occurred in sulfidic solutions which resulted in the loss of dissolved arsenite. These results have implications concerning the practice of acidifying water samples containing hydrogen sulfide with HCl or HNO3 for the purpose of preserving total arsenic values. If a near-neutral water sample contains 1 ppm arsenite and as little as 0.4 ppm sulfide, loss of dissolved arsenic will occur upon acidification. An alternative three-step preservation method involving base addition, oxidation, and acidification is proposed and investigated as an appropriate technique for preserving sulfide-bearing aqueous samples for total arsenic.

Back to tab navigation

Publication details

The article was received on 09 Jun 2003, accepted on 05 Sep 2003 and first published on 16 Oct 2003

Article type: Paper
DOI: 10.1039/B306567G
Citation: J. Environ. Monit., 2003,5, 913-916

  •   Request permissions

    Preservation of sulfidic waters containing dissolved As(III)

    J. A. Smieja and R. T. Wilkin, J. Environ. Monit., 2003, 5, 913
    DOI: 10.1039/B306567G

Search articles by author