Shellfish are found in the coastal region throughout the tropical, sub-tropic and temperate zone. A variety of shellfish species are known in nature. Being filter-feeding organisms, organic and inorganic substances easily gain entry into them. Very often, heavy metals such as Cd, Pb, Cu, and even Hg can accumulate in their bodies. The presence of these heavy metals in shellfish is an indicator of environmental pollution, and a threat to humanity as these fish are widely consumed in coastal regions. Here, biochemical analysis of exoskeleton shell mainly composed of polysaccharides, proteins and calcium carbonate (CaCO3) - have been studied. Calcium carbonate (CaCO3) which is one of the major constituent of the exoskeleton part of the shellfish exists in three polymorphs viz., calcite, aragonite and vaterite. The identification of CaCO3 polymorphs in shellfish is extremely important as it gives information on the structural arrangement of the calcium carbonate lattice in these organisms. Here, we present a convenient method for the identification of CaCO3 polymorphs in shellfish collected from Goa, west coast of India, with Fourier-Transform Infrared Spectroscopy (FTIR) and further confirmed by powder X-ray analysis. Additionally, the potential of the powdered shell biomass for metal removal from an aqueous medium has also been investigated.

中文翻译：

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FTIR光谱法鉴定贝类CaCO3多晶型及粉末外骨骼壳对金属吸附的评价

贝类遍布热带、亚热带和温带的沿海地区。自然界中已知有多种贝类。作为滤食性生物，有机和无机物质很容易进入其中。很多时候，镉、铅、铜甚至汞等重金属都会在它们的体内积累。贝类中这些重金属的存在是环境污染的一个指标，并且对人类构成威胁，因为这些鱼在沿海地区被广泛消费。在这里，已经研究了主要由多糖、蛋白质和碳酸钙 (CaCO3) 组成的外骨骼壳的生化分析。碳酸钙 (CaCO3) 是贝类外骨骼部分的主要成分之一，存在三种多晶型物，即方解石、文石和球霰石。贝类中 CaCO3 多晶型物的鉴定非常重要，因为它提供了有关这些生物体中碳酸钙晶格结构排列的信息。在这里，我们提出了一种使用傅里叶变换红外光谱 (FTIR) 鉴定从印度西海岸果阿采集的贝类中 CaCO3 多晶型物的简便方法，并通过粉末 X 射线分析进一步证实。此外，还研究了粉状壳生物质从水性介质中去除金属的潜力。傅里叶变换红外光谱 (FTIR) 并通过粉末 X 射线分析进一步证实。此外，还研究了粉状壳生物质从水性介质中去除金属的潜力。傅里叶变换红外光谱 (FTIR) 并通过粉末 X 射线分析进一步证实。此外，还研究了粉状壳生物质从水性介质中去除金属的潜力。