Ultraviolet absorbance as a proxy for total dissolved mercury in streams.
Environ Pollut
; 157(6): 1953-6, 2009 Jun.
Article
em En
| MEDLINE
| ID: mdl-19250728
ABSTRACT
Stream water samples were collected over a range of hydrologic and seasonal conditions at three forested watersheds in the northeastern USA. Samples were analyzed for dissolved total mercury (THg(d)), DOC concentration and DOC composition, and UV(254) absorbance across the three sites over different seasons and flow conditions. Pooling data from all sites, we found a strong positive correlation of THg(d) to DOC (r(2)=0.87), but progressively stronger correlations of THg(d) with the hydrophobic acid fraction (HPOA) of DOC (r(2)=0.91) and with UV(254) absorbance (r(2)=0.92). The strength of the UV(254) absorbance-THg(d) relationship suggests that optical properties associated with dissolved organic matter may be excellent proxies for THg(d) concentration in these streams. Ease of sample collection and analysis, the potential application of in-situ optical sensors, and the possibility for intensive monitoring over the hydrograph make this an effective, inexpensive approach to estimate THg(d) flux in drainage waters.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Árvores
/
Poluentes Químicos da Água
/
Rios
/
Mercúrio
País como assunto:
America do norte
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article