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Chromatografy Methods for Environmental - Ando D.J.

Ando D.J. Chromatografy Methods for Environmental - Wiley publishing , 2003. - 265 p.
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River water (As(iii), As(v), MMAA and DMAA) No preservation 20-26 h 11
Marine samples Mercury speciesc Freeze at — 20° C followed by freeze-drying 12-14
Water Glass bottles — — 15, 16
Water (total Hg) Poly(ethylene terephthalate) 0.5% of 20% (wt/vol) potassium dichromate dissolved in 1:1 HNO3 10 days 17
Water — Presence of humic substances will preserve methylmercury if stored at 4°C and in the dark 33 days 18
Fish extract solutions (fish homogenate mixed with HCl/CuS04 and extracted into toluene) Store at 4°C in the dark 5 months 19
Tuna fish (reference material) Chromium species'1 Store at 20 and 40° C in the dark 12 months 20
Waste water — — As soon as possible 21
Water (Cr(m) and Cr(vi)) Quartz ampoules Store at 5°C at pH 6.4 (with HCO37H2CO3 buffer under CO2 to avoid Cr(vi) reduction) 228 days 22
QFor example, organotins (OTs), monobutyltin (ÌÂÒ), dibutyltin (DBT), tributyltm (TBT) and triphenyltin (TPT).
^For example, arsenite (As(iii)), arsenate (As(v)), monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA), arsenobetaine (AsB) and arsenocholine (AsC). cFor example, methylmercury.
^For example, Cr(m) and Cr(vi).
Methods for Environmental Trace Analysis
Storage of Samples
45
4.3 Summary
It has been seen that the main emphasis in this chapter is to store the sample for the minimum amount of time. If the sample has to be stored because the next stage of the procedure cannot be carried out straight away due to lack of equipment, staff availability or because the sample must be transported over a large distance, procedures are available and have been discussed. The following chapters next describe how the sample is to be treated prior to the analysis step. This frequently involves extraction from the matrix for organic compounds, while for metals digestion of the matrix is often used although, as you will observe, other selective approaches are possible.
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Methods for Environmental Trace Analysis. John R. Dean
Copyright © 2003 John Wiley & Sons, Ltd.
ISBNs: 0-470-84421-3 (HB); 0-470-84422-1 (PB)
Sample Preparation for Inorganic Analysis
Methods for Environmental Trace Analysis. John R. Dean
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