Cadmium Removal byLemna minorandSpirodela polyrhiza

Abstract

The present study investigates the ability of two genus of duckweed (Lemna minor and Spirodela polyrhiza) to phytoremediate cadmium from aqueous solution. Duckweed was exposed to six different cadmium concentrations, such as, 0.5,1.0,1.5, 2.0, 2.5, and 3.0 mg/L and the experiment was continued for 22 days. Water samples were collected periodically for estimation of residual cadmium content in aqueous solution. At the end of treatment period plant samples were collected and accumulated cadmium content was measured. Cadmium toxicity was observed through relative growth factor and changes in chlorophyll content Experimental results showed that Lemna minor and Spirodela polyrhiza were capable of removing 42-78% and 52-75% cadmium from media depending upon initial cadmium concentrations. Cadmium was removed following pseudo second order kinetic model Maximum cadmium accumulation in Lemna minor was 4734.56 mg/kg at 2 mg/L initial cadmium concentration and 7711.00 mg/kg in Spirodela polyrhiza at 3 mg/L initial cadmium concentration at the end of treatment period. Conversely in both cases maximum bioconcentration factor obtained at lowest initial cadmium concentrations, i.e., 0.5 mg/L, were 3295.61 and 4752.00 for Lemna minor and Spirodela polyrhiza respectively. The present study revealed that both Lemna minor and Spirodela polyrhiza was potential cadmium accumulator.

Removal of Cr, Ni and Co in the water of chromium mining areas by using Lemna gibba L. and Lemna minor L

“…Floating macrophytes usually uptake metal or contaminants through the process of rhizofiltration (Chaudhuri et al . ). Lemna sp.…”

“…Phytoremediation depends on the ion uptake mechanism, as well as the physiological, anatomical and morphological characteristics of each species (Rahman & Hasegawa 2011). Floating macrophytes usually uptake metal or contaminants through the process of rhizofiltration (Chaudhuri et al 2014). Lemna sp.…”

Generating a high‐confidence reference genome map of the Greater Duckweed by integration of cytogenomic, optical mapping, and Oxford Nanopore technologies

“…Phylogenetically, duckweeds were considered as a subfamily (Lemnoideae) of the family Araceae (Cabrera et al, 2008;Cusimano et al, 2011;Nauheimer et al, 2012) but more recently proposed to be a separate family (Lemnaceae) with subfamilies of Lemnoideae and Wolffioideae (Les et al, 2002;Appenroth et al, 2015;Sree et al, 2016). Due to notable features of duckweeds such as their worldwide distribution (except in the Arctic and Antarctica), water surface habitat, fast growth rate and yielding up to 100 tons dry mass/hectare/year (Lam et al, 2014;Ziegler et al, 2015), the ability to remove contaminants from wastewater (Chaudhuri et al, 2014;Goswami et al, 2014;Teixeira et al, 2014), high quality and quantity of protein (Rusoff et al, 1980;Appenroth et al, 2017), and high starch content in some strains under particular growth conditions (Cui and Cheng, 2015;Sree et al, 2015;Ma et al, 2018), duckweeds are attractive as a new crop production platform. They are considered as a potential resource for an increasing world population, useful for wastewater remediation, feedstock for biofuels, animal feed, as well as for human nutrition, without competing with traditional crops for arable land.…”

Biosorption of nickel and cadmium in the presence of diethylketone by a Streptococcus equisimilis biofilm supported on vermiculite

“…The contaminants may include heavy metals, polyaromatic hydrocarbons and volatile organic compounds that are harmful to humans due to their carcinogenic, mutagenic and toxic properties, their ability to produce hazardous intermediates and to persist in the environment (Volesky, 1990;Vieira et al, 2010;Costa et al, 2012). Some of these substances are hardly degraded in nature and can easily bio-accumulate via food chain in living tissues, triggering numerous diseases and health disorders (Srivastava et al, 2006;Qin et al, 2012;Chaudhuri et al, 2014).…”