Sulfate radical (SO4(•-)) is a strong, short-lived oxidant that is produced when persulfate (S2O8(2-)) reacts with transition metal oxides during in situ chemical oxidation (ISCO) of contaminated groundwater. Although engineers are aware of the ability of transition metal oxides to activate persulfate, the operation of ISCO remediation systems is hampered by an inadequate understanding of the f...

iodine. The data presented are consistent with the formation of a covalent linkage between MAB and DNA or RNA under these mild conditions. The covalently linked MAB cannot be extracted by organic solvents that remove the physically bound MAB from the nucleic acid. A chemical linkage was further indicated by gel filtration and equilibrium dialysis of the nucleic acid:MAB complexes. Hydrolysis of...

In this study, the degradation of sulfonamide antibiotics was investigated through persulfate-enhanced UV advanced oxidation process. Factors that may affect efficiency were analyzed. Results showed persulfate imposed a significant enhancement on process during sulfathiazole degradation. The combined UV/persulfate can effectively remove about 96% within 60 min. With increase in dosage persulfat...

Organic contaminants, volatile organic compounds (VOCs), and heavy metals have posed long-term threats to the ecosystem human health. Natural minerals aroused widespread interest in field of environmental remediation due their unique characteristics such as rich resources, environmentally benign, excellent photoelectric properties. This review briefly introduced contributions natural sulfide mi...

A flow-injection system with a glassy carbon disk electrode modified with Prussian Blue film is proposed for the determination of persulfate in commercial samples of hair bleaching boosters by amperometry. The detection was obtained by chronoamperometric technique and the sample is injected into the electrochemical cell in a wall jet configuration. Potassium chloride at concentration of 0.1 mol...

Sodium persulfate is a common oxidant used for in situ chemical oxidation (ISCO) remediation of ground water contaminants (e.g., trichloroethylene (TCE)). Following ISCO unused persulfate and oxidation by-products such as sulfates remain within the groundwater at elevated levels. In this laboratory study the performance of three membranes: one nanofiltration (NF) membrane (designated DK) and tw...

Poly- and perfluoroalkyl substances (PFASs) have been detected in an increasing number of water supplies. In many instances, the contamination is associated with the use of PFAS-containing aqueous film-forming foams (AFFF) in firefighting activities. To investigate the potential for remediating AFFF contamination in groundwater with heat-activated persulfate, PFAS oxidation and the generation o...

The Du Pont aca “NBIL” test (Du Pont Instruments, Wilmington, DE 19898) also measures bilirubin spectrophotometrically. Figure 2 shows an approximate linear relationship between “apparent” biliburin concentration, as measured with the Bilirubin Stat-Analyzer and the aca NBIL test, vs Liposyn concentration in a neonatal serum sample. This sample without added Liposyn gave identical total bilirub...