ABSTRACT

Safe levels of extractable heavy metals in land-uses urban soil have not been universally established. The pollution of land-uses soils in ancient Pundranagar, Bangladesh arouses growing interest because of severe anthropogenic stress, urbanization, ecotourism, overexploitation of natural resources, and discharges of industrial as well as municipal waste. Our study unfolds the extent of heavy metal pollution in the land-uses surface soil of this ancient terrestrial ecosystem and also investigates the contamination status, source, and ecological risks using pollution indices techniques. Total 90 soil samples were collected from six different land-uses and heavy metals were analyzed by inductively coupled plasma mass spectrometer. The concentration ranges of chromium (Cr), nickel (Ni), copper (Cu), arsenic (As), cadmium (Cd), lead (Pb), iron (Fe), manganese (Mn) and zinc (Zn) in land-uses soils were 5.04–73.06, 18.26–313.2, 25.51–370.6, 4.83–36.30, 0.54–17.25, 8.60–187.9, 1128–8155, 35.04–129.1 and 8.60–187.9 mg/kg, respectively. Multivariate principal component analysis showed that Ni, Pb, Mn, Cu, and Zn in soil mainly from anthropogenic sources while As from lithogenic or natural sources. Considering the potential ecological risk, soil from all land uses showed moderate to high ecological risk. Analysis of the results indicates the alarming condition of this ancient terrestrial ecosystem.

摘要

土地利用城市土壤中可提取重金属的安全水平尚未普遍确定。由于严重的人为压力、城市化、生态旅游、自然资源的过度开发以及工业和城市垃圾的排放，孟加拉国古彭德拉纳格尔土地利用土壤的污染引起了越来越多的关注。我们的研究揭示了这个古老陆地生态系统土地利用表层土壤中重金属污染的程度，并使用污染指数技术调查了污染状况、来源和生态风险。从六个不同的土地利用中收集了总共 90 个土壤样品，并通过电感耦合等离子体质谱仪分析了重金属。铬（Cr）、镍（Ni）、铜（Cu）、砷（As）、镉（Cd）、铅（Pb）、铁（Fe）、土地利用土壤中的锰（Mn）和锌（Zn）分别为5.04-73.06、18.26-313.2、25.51-370.6、4.83-36.30、0.54-17.25、8.60-187.9、1128-8155、35.04-129.1和8.60-187。毫克/公斤，分别。多元主成分分析表明，土壤中的Ni、Pb、Mn、Cu、Zn主要来自人为来源，而As来自岩石或天然来源。考虑到潜在的生态风险，所有土地利用的土壤均表现出中度至高度的生态风险。对结果的分析表明，这个古老的陆地生态系统的状况令人担忧。土壤中的 Zn 主要来自人为来源，而 As 来自岩石或天然来源。考虑到潜在的生态风险，所有土地利用的土壤均表现出中度至高度的生态风险。对结果的分析表明，这个古老的陆地生态系统的状况令人担忧。土壤中的 Zn 主要来自人为来源，而 As 来自岩石或天然来源。考虑到潜在的生态风险，所有土地利用的土壤均表现出中度至高度的生态风险。对结果的分析表明，这个古老的陆地生态系统的状况令人担忧。