Extractive separation and determination of chromium in tannery effluents and electroplating waste water using tribenzylamine as the extractant

Characteristics of amine-crosslinked wheat straw and its adsorption mechanisms for phosphate and chromium (VI) removal from aqueous solution

“…These wastewaters are frequently laden with toxic heavy metals or nutrient substances in which significant amounts are deposited into the natural aquatic and terrestrial ecosystems (Wang, Chen, Chen, Wan, & Tang, 2010). Among these heavy metals, chromium is one of the priority contaminants in the environment which originates from the emissions of industry including electroplating, pigment, metal cleaning, leather processing and mining (Dinesh, Charles, & Pittman, 2006;Kalidhasan, Ganesh, Sricharan, & Rajesh, 2009). Chromium exists in natural water in two stable oxidation states, chromium (VI) and chromium (III).…”

Reducing sulfates concentration in the tannery effluent by applying pollution prevention techniques and nanofiltration

“…On the other hand, Taleb Ahmed et al (Taleb-Ahmed et al, 2004 proposed the combination of a physicalechemical treatment and nanofiltration to eliminate chromium from the tanning wastewater. Other methods for chromium recovery from tannery effluents have also been reported in the literature (Guo et al, 2006;Onyancha et al, 2008;Kanagaraj et al, 2008;Kalidhassan et al, 2009). …”

Selective extraction of chromium(VI) using a leaching procedure with sodium carbonate from some plant leaves, soil and sediment samples

“…Most of speciation methods are based on a previous pretreatment step of the sample to separate and preconcentrate one oxidation state and sequential determination of both chromium forms. The methods currently used include solid phase extraction [19][20][21][22][23][24][25], liquid-liquid extraction [26,27], coprecipitation [28][29][30], ion exchange [31,32]. In many cases, several manipulation steps, which are time consuming, complex and labor-intensive, are required.…”