scholarly journals Purification of waters and elimination of organochloric insecticides by means of active coal

2010 ◽  
Vol 75 (4) ◽  
pp. 575-586
Author(s):  
Dragan Marinovic ◽  
Marina Stojanovic ◽  
Danilo Popovic
Keyword(s):  
Waste Water ◽  
Water Samples ◽  
Human Population ◽  
Toxic Substances ◽  
Organoleptic Properties ◽  
Physical Chemical ◽  
Active Coal ◽  
Health Related ◽  
Coconut Shells

Pollution of water and the determination of the degree of its pollution with numerous physical, chemical and biological polluters have become general, ever increasing social and health related problems. Within this study, the concentrations of some most frequently used organochloric insecticides (OCI): ?-hexachlorocyclohexane (?-HCH), ?- hexachlorocyclohexane (lindane), heptachlor, aldrin, dieldrin, endrin, dichlorodiphenyl trichlorethane (DDT) were investigated. OCI are highly toxic substances for the human population and their effective elimination from the environment is of paramount interest. To determine the OCI concentration in water samples, the EPA-608 method and the liquidliquid extraction principle were applied. A procedure for OCI elimination was realized by passing the water over four columns filled with various active coals: KRF, K-81/B, NORIT ROW-0.8 and AQUA SORB CS. These active coals are carbonized coconut shells activated by different procedures. The obtained results indicated that best purification of potable and waste water achieved using a column with NORIT ROW-0.8 filling. Research proved that small quantities of OCI can also be effectively removed using a NORIT ROW-0.8 active coal filled column, without altering the organoleptic properties of the water, which meets the requirements of water purification processes.

A Dithiothreitol-Modified Nanogold Resonance Rayleigh Scattering Spectral Probe for Detection of Trace Cr(VI)

2013 ◽  
Vol 668 ◽  
pp. 370-374
Author(s):  
Jin Qiao Long ◽  
Li Li Xu ◽  
Bin Chen ◽  
Ai Hui Liang ◽  
Zhi Liang Jiang
Keyword(s):  
Waste Water ◽  
Detection Limit ◽  
Water Samples ◽  
Rayleigh Scattering ◽  
Sodium Citrate ◽  
Regression Equation ◽  
Resonance Rayleigh Scattering

Cr(VI); dithiothreitol; Nanogold; Resonance Rayleigh scattering spectral assay. Abstract. Nanogold (NG) in size of 15 nm was prepared by sodium citrate procedure, and it was modified by 1,4-dithiothreitol (DTT) to form NG-DTT probe for Cr(VI). In diluted H2SO4 medium, the probe interacted with Cr(VI) to form big NG clusters that led to the resonance Rayleigh scattering (RS) peak at 720 nm increased greatly. Under the selected conditions, the increased RS intensity (ΔI720nm) is linear to Cr(VI) concentration in the range of 10-50 nmol/L, with a regression equation of ΔI720nm= 2.05 C-7.5, coefficient of 0.9989, and a detection limit of 5 nmol/L. This nanogold RS method was applied to determination of Cr(VI) in waste water samples, with satisfactory results.

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