Journal of Environmental Health 2013 Abstracts - page 15

percentage of unsafe test results emphasizes the importance of water quality monitoring
to the health of nearly one million families including 300,000 Wisconsin children whose
drinking water comes from a privately owned well.
Nitrate and Ammonia Contaminations in Drinking Water and the Affecting Factors
in Hailun, Northeast China
Xinfeng Zhao,
Research Center for Eco-Environmental
Sciences, Chinese
Academy of
Sciences
Liding Chen,
Research Center for Eco-Environmental
Sciences, Chinese
Academy of
Sciences
Haiping Zhang,
Research Center for Eco-Environmental
Sciences, Chinese
Academy of
Sciences
Abstract
Drinking water samples (
N =
228) from domestic tube wells (DTWs) and seven
samples from public water supply wells (PWSWs) were collected and tested in Hailun,
northeast China. The percentage of samples with nitrate and ammonia concentrations
above the maximum acceptable concentration of nitrate, 10 mg N/L, and the maximum
ensure concentration of ammonia, 1.5 mg/L, for the DTWs were significantly higher than
for the PWSWs. Of the DTWs, an important observation was that the occurrence of
groundwater nitrate contamination was directly related to well tube material with
different joint pathways. Nitrate in seamless-tube wells was lower statistically
significantly than those in multiple-section-tube wells (
p
< .001). Furthermore, well depth
and hydrogeological setting might have some impacts on nitrogen contamination and the
major sources of inorganic nitrogen contamination may be nitrogenous chemical
fertilizer. Therefore, PWSWs built for all families are the best way to ensure the drinking
water safety in villages. For DTWs it is necessary to use seamless tubes and to dig deep
enough according to the depth of groundwater level. Improving the efficiency of
chemical fertilizer use would also reduce the risk of groundwater contamination.
Noise Disturbances in Daycare Centers Before and After Acoustical Treatment
Lars Gerhardsson, MD,
Occupational and Environmental Medicine
,
Sahlgrenska
Academy and University Hospital
Erling Nilsson,
Saint-Gobain Ecophon AB
Abstract
The authors’ aim was to study noise-related problems in personnel at Swedish
daycare centers. The authors’ study comprised staff (
N
= 81) who completed a
questionnaire (noise, illumination, indoor climate, hearing problems) at five daycare
centers with noise problems. After basic and activity sound measurements, absorbers
were attached to the ceilings and to two adjacent walls in the playing and dining rooms.
Thereafter, basic and activity sound measures were repeated and the questionnaire was
also repeated six months later. The acoustical treatment reduced the sound pressure levels
by 2 to 6 dB in the playing rooms and by 0 to 3 dB in the dining rooms. The
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