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Assessing Chenopodium album L. potential for phytoremediation of lead-polluted soils
| Content Provider | Semantic Scholar |
|---|---|
| Author | Alipour, Abbas Homaee, Mehdi Safoora, C. |
| Copyright Year | 2014 |
| Abstract | The objective of this study was to investigate the capability of Chenopodium album L. to remediate lead polluted soils. For this purpose, a randomized block experiment design was performed. The soil was contaminated with PbNO3 and the treatments were consisted of 0 (standard), 150, 300, 600, 900 and 1200 mg/kg lead. After development, plants were harvested and divided into shoot and root parts. The lead content of shoot, root and also the soil-lead were measured. The results indicated that by increasing the lead concentration in soil, its accumulation in plant tissues was also increased. By increasing lead concentration in the soil,the metal transport factor was decreased. According to the obtained results, the resistance index of Chenopodium album L. was more than 1. Therefore, concerning its resistant and its high biomass, halophyte Chenopodium album L. can be used as a hyperaccumulator plant to remediate lead polluted soils. Keywords—Chenopodium album L, lead, phytoremediation, pollution I.INTRUDOCTION Phytoremedian is one of the newly proposed methods to remediate soils from heavy metals. In this method plants are used to clean up the contaminated soils [3]. Many investigations by several researchers were conducted on different aspects of phytoremediation [9]-[12]-[4]-[7]-[8][10]-[5]-[6]-[1]and all confirm that this technology is sustainable to clean up the contaminated soils, Although this method is inexpensive, efficient and environment-friendly, but it is a time-consuming method. The first recognized plants to accumulate heavy metals belonging to Brassicaceae and Fabaceae families [2]. The objective of this study was to investigate the capability of Chenopodium album L. to extract lead from contaminated soils with high content of Pb. II. Material and methods This research was conducted in a randomized block experimental design with six treatments and four replicates. The designed treatments were consisted of 150 (standard), 300, 600, 900 and 1200 mg/kg lead.To get some information about physical and chemical properties of the experimental soils, some soil samples wereair dried, mixed, passed through 2 mm sieve to measure their cadmium contents. Experiments including electricalconductivity of saturation extract was measured with a conductivity meter, soil organic matter concentration with WalkleyandBlackmethod, soil texture with hydrometer method, calcium carbonate content with titration method, bulk density with cylinder method, cation exchange capacity with cations situation with sodium acetate and soil pH was measured with with a pH meter. Table 1 gives some physical and chemical properties of the experimental soils. Table 1. Some physical and chemical properties of the experimental soil Bulk density (gr/cm) pH CEC (cmolc/kg) CaCO3 (%) O.M (%) ECe (dS/m) Soil texture 1.33 7.58 14 7.5 0.7 6.71 Sandy clay loam To contaminate the experimental soils, the soils were first thoroughly sprayed with PbNO3. Five other treatments including 150, 300, 600, 900 and 1200 mg/kg lead denoted as Pb2, Pb3, Pb4, Pb5, Pb6 were established withfour replicates for each treatment. To obtain chemical equilibrium between contaminant and soil and also to create natural contamination conditions,the experimental treatments with their replicates were left for 50 days, receiving enough water every 24 hours. When the chemical equilibrium between lead and soil was obtained, different lead forms in the soil treatments were measured. The soils were weighted about 7 kg for each pot and were carefully packed in the pots to obtain a uniform bulk density of 1.33 g/cm. After that the seeds were seeded in the pots. To prevent any water stress during the growth period, soil water content was always held at field capacity. When plants were fully developed, plants were harvested and divided into shoot and root parts. Different chemical forms of lead concentrations in the soil were then measured with continuous extraction method [11]. The lead concentration in shoots and roots was measured by digestion with complex of nitric acid-perchloric acid and sulfuric acid with 1:4:40volume based and analyzed for Pb by ICP-ES apparatus.The soil lead concentration was measured, using theAtomic Absorption apparatus. Finally, the effect of soil lead concentration on lead absorbed by different parts of plant including shoot and roots was performed with statistical comparison of averages, using the Duncan’s multiple range test method with SPSS software. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.inase.org/library/2014/venice/bypaper/ENVIR/ENVIR-15.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
