Are you between 5 and 25? If so, enter the Wicked Young Writer Awards NOW - click here for details...

make the most of Lovereading
Search our site
Last Letter from Istanbul by Lucy Foley Read the opening extract of the brand new Lucy Foley book before its publication on 19/03/2018

Preservation of Arsenic Species by Dennis A. Clifford, Gautam Samanta


Preservation of Arsenic Species by Dennis A. Clifford, Gautam Samanta

In order to establish effective treatment removal strategies for arsenic, it is important to know the actual concentrations of As(III) and As(V) in drinking waters. Due to its anionic character, As(V) can be removed more easily than As(III). The distribution of As(III) and As(V) species depends greatly on the abundance of redox-active solids, especially organic carbon, the activity of microorganisms, and the extent of diffusion of O2 from the atmosphere. In strongly reducing aquifers, As(III) is the dominant species based on the thermodynamic considerations, whereas As(V) is the more stable oxidation state under oxic conditions or in oxygenated waters. Based on extensive experimental results in Fe(II)-contaminated challenge water, it was found that EDTA-HAc could be used to preserve the arsenic species for at least 28 days in opaque plastic bottles. Although the alternative preservatives, H2SO4 and H3PO4, successfully preserved the original As(III)/(V) speciation under some conditions, these preservatives were generally unsuccessful for the desired 28-day period under reducing and oxidizing conditions in the sample pH range of 6.5?V8.4 and in the presence of 3 mg/L Fe(II). A comprehensive, systematic study was conducted to determine the effect of ferrous iron on the stability of arsenic species. Among the promising preservatives described in the literature, H2SO4, H3PO4, EDTA, and EDTA-HAc were chosen for this study. The combined results of two AwwaRF arsenic analysis projects 'Field Speciation Method for Arsenic Inorganic Species' and this project, Preservation of Arsenic Species have yielded a method for immediate field-speciation and a preservation technique for speciation within 30 days of sampling. Limited field verifications of these methods, which give statistically indistinguishable results, have been completed.

About the Author

Loading other formats...

Book Info

Publication date

1st May 2007


Dennis A. Clifford, Gautam Samanta

More books by Dennis A. Clifford, Gautam Samanta
Author 'Like for Like'


IWA Publishing


148 pages


Environmental science, engineering & technology



I recommend Lovereading because you get honest reviews on a whole range of genres-there's something for everyone. It's the only site I need.

Sian Spinney

I love Lovereading for the wonderful like for like author recommendations and for highlighting new books, it's a great resource for readers!


I love the honest opinions, recommendations for every genre and every reader, wish lists and Like for Like.

Amrita Dasgupta

It has enriched my leisure time by introducing me to a world of books which I would not have previously considered.

Val Rowe

Because of Lovereading I have broadened my reading horizons with some really great books that I probably would never have chosen myself.

Susan Walsh

I love reading books I wouldn't normally choose before everyone else gets to read them!

Dawn Lynch

Love Reading - it not only does what it says on the tin, it does it with Jam on!!

Maz Tucker

Their sending me my first book to review 18 months ago re-awakened my fondness for reading, since then I have purchased some real gems.

Barry Griffiths