Water quality of the Waiohewa Stream, Rotorua
作者:
R. B. Williamson,
J. G. Cooke,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1982)
卷期:
Volume 16,
issue 3-4
页码: 327-337
ISSN:0028-8330
年代: 1982
DOI:10.1080/00288330.1982.9515976
出版商: Taylor & Francis Group
关键词: Waiohewa Stream;Rotorua;water quality;geothermal;nitrogen;nutrients;toxicants;oxygen demand;water analysis;water sampling;nitrogen cycle
数据来源: Taylor
摘要:
The chemical quality of the Waiohewa stream, Rotorua, was assessed from the results of 2 longitudinal surveys in summer 1978–79. In particular, changes in nitrogen concentration were examined. The quantity of ammonia increased downstream from unmonitored geothermal inputs, but, after dilution and neutralisation by a larger inflow of freshwater, considerable proportions of ammonia were converted to nitrate. In the first survey ammonia concentrations decreased from 4.48 to 2.47 g m‐3and nitrate concentrations increased from 0.59 to 1.13 g‐3in a 3‐km stretch of the stream. Mass flow calculations show that nitrification could account for at least 55% of the ammonia decrease, the rest probably being lost through assimilation or denitrification. Laboratory incubation experiments showed that nitrification occurred in the stream bed. The geothermal waters contained low concentrations of boron (1.1–4.0 g m‐3), filterable mercury (0.1–0.8 mg m‐3) and arsenic (10–14 mg m‐3).
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