The effect of zinc orthophosphate and pH-alkalinity adjustment on metal levels leached into drinking water

2000 ◽  
Vol 27 (1) ◽  
pp. 33-43 ◽  
Author(s):  
D M Churchill ◽  
D S Mavinic ◽  
D G Neden ◽  
D M MacQuarrie
Keyword(s):  
Drinking Water ◽  
Treatment Options ◽  
Loop System ◽  
Metal Leaching ◽  
Control Loop ◽  
Free Standing ◽  
Standing Time ◽  
Copper And Zinc ◽  
Metal Levels ◽  
Zinc Levels

A 12-month pilot plant study was conducted to evaluate a number of corrosion control treatments to reduce metal leaching from typical household plumbing materials. A pipe loop system was used to test six treatment options, with a control loop of the characteristically soft, acidic, Greater Vancouver Water District (GVWD) water. Four pH- alkalinity combinations and two concentrations of zinc orthophosphate (0.37 mg/L and 1.0 mg/L as Zn) were studied. at regular intervals, the flowing, treated, and control waters were allowed to stagnate in the pipe loop system for 8- and 16-h periods. Following the designated standing time, water samples taken from the lead/tin solder jointed, soft copper plumbing coils, the submerged, free standing coils of 50/50 lead/tin solder, and the brass faucets, were measured for lead, copper, and zinc levels. Overall, when compared to the control loop, the pH-alkalinity treatments appeared to exacerbate metal leaching in standing samples. The zinc orthophosphate treated loops were both effective at reducing lead and copper leaching to below control levels. In general, the two standing times showed little difference in the levels of leached metals. The exception to this occurred in the higher dose zinc orthophosphate loop, which had higher copper and zinc levels at the longer standing time. Key words: copper, corrosion, drinking water, lead, zinc orthophosphate.

EDTA toxicity and background concentrations of copper and zinc in Hyalella azteca

1995 ◽  
Vol 52 (4) ◽  
pp. 875-881 ◽  
Author(s):  
U. Borgmann ◽  
W. P. Norwood
Keyword(s):  
Culture Media ◽  
Hyalella Azteca ◽  
Dry Weight ◽  
Complexing Agent ◽  
Copper Uptake ◽  
Background Concentrations ◽  
Copper And Zinc ◽  
Metal Levels ◽  
Zinc Concentrations ◽  
Zinc Levels

The effect of the strong metal-complexing agent EDTA on survival, growth, and copper and zinc concentrations in Hyalella azteca was studied to determine if metal concentrations in control amphipods represent minimum physiological levels. Exposure to EDTA concentrations of up to 560 μM for 1 week did not reduce metal levels (mean background = 1.2 μmol Cu/g and 1.0 μmol Zn/g dry weight), indicating that background metals are firmly bound to Hyalella. Chronic (4 week) exposure to EDTA resulted in increased mortality and reduced growth rates, both of which could be partially ameliorated by adding zinc to culture media. This implies that EDTA toxicity results, in part, from zinc deficiency. In spite of this, however, zinc concentrations in Hyalella were not reduced in amphipods raised in the presence of high EDTA, implying that the observed background zinc levels represent minimum physiological levels. Copper additions to media were ineffective at reducing EDTA toxicity. Nevertheless, control concentrations are probably close to minimum physiological levels for copper as well, because high EDTA did not appreciably reduce copper in Hyalella in chronic tests, in spite of its ability to impair copper uptake from water at moderate water concentrations.

Serum copper and zinc levels and copper/zinc ratio in patients with breast cancer

1994 ◽  
Vol 40 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Idris Yücel ◽  
Fikret Arpaci ◽  
Ahmet Özet ◽  
Bülent Döner ◽  
Turan Karayilanoĝlu ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Serum Copper ◽  
Copper And Zinc ◽  
Copper Zinc ◽  
Zinc Levels

scholarly journals Metals Exposures of Residents Living Near the Akaki River in Addis Ababa, Ethiopia: A Cross-Sectional Study

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ellen Yard ◽  
Tesfaye Bayleyegn ◽  
Almaz Abebe ◽  
Andualem Mekonnen ◽  
Matthew Murphy ◽  
...  
Keyword(s):  
Drinking Water ◽  
Addis Ababa ◽  
Urinary Iodine ◽  
Reference Value ◽  
Cross Sectional Study ◽  
World Health ◽  
Sectional Study ◽  
Cross Sectional ◽  
Metal Levels ◽  
Akaki River

Background. The Akaki River in Ethiopia has been found to contain elevated levels of several metals. Our objectives were to characterize metals exposures of residents living near the Akaki River and to assess metal levels in their drinking water.Methods. In 2011, we conducted a cross-sectional study of 101 households in Akaki-Kality subcity (near the Akaki River) and 50 households in Yeka subcity (distant to the Akaki River). One willing adult in each household provided urine, blood, and drinking water sample.Results. Urinary molybdenum (p<0.001), tungsten (p<0.001), lead (p<0.001), uranium (p<0.001), and mercury (p=0.049) were higher in Akaki-Kality participants compared to Yeka participants. Participants in both subcities had low urinary iodine; 45% met the World Health Organization (WHO) classification for being at risk of moderate iodine deficiency. In Yeka, 47% of households exceeded the WHO aesthetic-based reference value for manganese; in Akaki-Kality, only 2% of households exceeded this value (p<0.001). There was no correlation between metals levels in water samples and clinical specimens.Conclusions. Most of the exposures found during this investigation seem unlikely to cause acute health effects based on known toxic thresholds. However, toxicity data for many of these metals are very limited.

scholarly journals Serum copper and zinc levels at diagnosis and hepatocellular carcinoma survival in the Guangdong Liver Cancer Cohort

2019 ◽  
Vol 144 (11) ◽  
pp. 2823-2832 ◽  
Author(s):  
Ai‐Ping Fang ◽  
Pei‐Yan Chen ◽  
Xiao‐Yan Wang ◽  
Zhao‐Yan Liu ◽  
Dao‐Ming Zhang ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Liver Cancer ◽  
Serum Copper ◽  
Copper And Zinc ◽  
Zinc Levels

Cadmium, Copper, and Zinc Levels in Rice and Soil of Japan, Indonesia, and China by Soil Type

2000 ◽  
Vol 64 (1) ◽  
pp. 33-39 ◽  
Author(s):  
N. Herawati *, ‡ , S. Suzuki ◽  
K. Hayashi ◽  
I. F. Rivai
Keyword(s):  
Soil Type ◽  
Copper And Zinc ◽  
Zinc Levels
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