scholarly journals Solar UV Photooxidation as Pretreatment for Stripping Voltammetric Trace Metal Analysis in River Water

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Gelaneh Woldemichael ◽  
Taffa Tulu ◽  
Gerd-Uwe Flechsig
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Trace Metal ◽  
River Water ◽  
Water Samples ◽  
Anodic Stripping Voltammetry ◽  
Metal Analysis ◽  
Trace Metal Analysis ◽  
Pet Bottles ◽  
Solar Uv

The application of solar ultraviolet radiation as sample pretreatment or preparation step in stripping voltammetric analysis of trace metals in presence of low levels of dissolved organic carbon (DOC) natural water samples (river water) was studied. River water samples were collected from downstream of Warnow river (Germany) and acidified to pH of2±0.2(by addition of 1 mL of ultrapure 65% HNO3per liter sample). Furthermore, 100 μL/L of hydrogen peroxide solution (ultrapure, 30% H2O2) was added to the samples as photochemical reaction initiator. The samples were transferred to polyethylene terephthalate (PET) bottles and irradiated with solar radiation of UV-A intensity of 3.6 mW/m2for six hours, and the concentrations of Zn, Cd, Pb, and Cu were determined by differential pulse anodic stripping voltammetry (DPASV). The comparison of the values with the results obtained for the original untreated sample and artificial UV-treated one proved that solar UV radiation can be applied to the digestion of dissolved organic carbon in trace metal analysis in natural waters like river water, lake waters, well waters, and so forth.

Minimization of the Disinfection by-Product Precursors in Treated Waters Exposed to Ozone and Chlorine

2014 ◽  
Vol 884-885 ◽  
pp. 91-95
Author(s):  
Shang Chao Yue ◽  
Le Jun Zhao ◽  
Xiu Duo Wang ◽  
Qi Shan Wang ◽  
Feng Hua He
Keyword(s):  
Drinking Water ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Water Supply ◽  
River Water ◽  
Water Samples ◽  
Full Scale ◽  
Ultraviolet Absorbance ◽  
Treatment Processes ◽  
Removal Efficiencies

The objectives of this study were to investigate impact of preoxidation on disinfection by-product (DBP) precursors in drinking water via two different preoxidation methods. The full-scale study was conducted on surface river water in a water supply plant in Tianjin, China. Two treatment trains were performed, with prechlorination and preozonation as preoxidation methods, respectively. The water samples were collected on different stages along the treatment processes and analyzed by following organic parameters: dissolved organic carbon (DOC), UV254 and specific ultraviolet absorbance (SUVA). The results indicated that Train 2 with preozonation was more effective to reduce DBP precursors. Preozonation possessed an excellent ability in the removal of UV254 and SUVA, the removal efficiencies were 25.14% and 18.77%, respectively, comparing to the removal rates of 6.66% and 5.64% during prechlorination, separately.

scholarly journals Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples

10.3791/53500 ◽  
2016 ◽  
Author(s):  
Tsung-Ting Shih ◽  
I-Hsiang Hsu ◽  
Ping-Hung Chen ◽  
Shun-Niang Chen ◽  
Sheng-Hao Tseng ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Trace Metal ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Metal Analysis ◽  
Trace Metal Analysis

Temperature-Programmable Furnace for Ashing of Foods in Trace Metal Analysis

1977 ◽  
Vol 60 (1) ◽  
pp. 239-240
Author(s):  
Walter Holak
Keyword(s):  
Trace Metal ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Atomic Absorption Spectrophotometry ◽  
Metal Analysis ◽  
Trace Metal Analysis ◽  
Absorption Spectrophotometry ◽  
Anodic Stripping ◽  
Cadmium Lead

Abstract The use of a programmable furnace in preparing samples for determining cadmium, lead, copper, and zinc by differential pulse anodic stripping voltammetry or atomic absorption spectrophotometry is convenient and timesaving. Recovery data for these 4 metals in various foods (tuna, sardines, and milk) were 93— 96% for 0.01—1 ppm cadmium, 96—114% for 0.05—5 ppm lead, 100—108% for 2—10 ppm copper, and 97% for 10 ppm zinc.

TRACE METAL ANALYSIS IN LONG ISLAND MARSH CORES

2020 ◽  
Author(s):  
Moread Achek ◽  
◽  
E. Christa Farmer ◽  
Brandon Buchbinder ◽  
Joyce Bowen ◽  
...  
Keyword(s):  
Trace Metal ◽  
Long Island ◽  
Metal Analysis ◽  
Trace Metal Analysis
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