Humex (humic lake acidification experiment): Chemistry, hydrology, and meteorology

Conference · Sat Jan 01 04:00:00 EST 1994 · Environment International; (United States)

OSTI ID:7067649

Gjessing, E T ^[1]

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1. Norwegian Institute for Water Research, Oslo (Norway)

The Humex project is an on-going whole-catchment manipulation project that studies the relationship between humic substances (HS) in soil and water and the acidification processes. The project is based on a dystrophic lake, which is artificially divided into experimental and control halves. This report describes the lake and its catchment and the technical installations used for the artificial acidification of the 1.8 ha terrestrial experimental area and the corresponding 0.9 ha lake. Chemical data from the experimental lake half and the control half are presented, covering a period of 24 months before and 30 months after start of treatment with H[sub 2]SO[sub 4] and NH[sub 4]NO[sub 3]. The results show that dividing the lake into two basins resulted in only small changes in the inorganic water chemistry. The concentration of HS, however, changed due to the difference in the ratio between lake volume and catchment area. The acidification treatment resulted in a 10% increase in ionic strength, mostly due to an increase in SO[sub 4], accompanied by Ca, Mg and Na. There was also a significant increase in the concentration of NO[sub 3], NH[sub 4], and organic N. The increase in SO[sub 4] and organic N can not be explained only by the amount of chemicals added directly to the lake 2 refs., 11 figs., 11 tabs.

• OSTI ID: 7067649
• Report Number(s): CONF-9306371--
• Conference Information: Journal Name: Environment International; (United States) Journal Volume: 20:3
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACIDIFICATION
AMMONIA
CHALCOGENIDES
CHEMISTRY
DEVELOPED COUNTRIES
ELEMENTS
ENVIRONMENTAL EFFECTS
EUROPE
FIELD TESTS
HUMUS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROLOGY
LAKES
METEOROLOGY
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
NORWAY
OXIDES
OXYGEN COMPOUNDS
SCANDINAVIA
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE WATERS
TESTING
WATER CHEMISTRY
WESTERN EUROPE