CADMIUM, LEAD AND MERCURY CONTENTS IN FISHES – CASE STUDY.docx

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1、j Journal of Microbiology,Biotechnology andToth et al. 2012 :1 (February Special issue) 837-847| Food SciencesREGULAR ARTICLECADMIUM, LEAD AND MERCURY CONTENTS IN FISHES - CASE STUDYTomas T6th,2*, Jaroslav Andreji3, Juraj Tth, Marek Sldvik9 Julius Arvayf Radovan StanovicAddress: Slovak University of

2、 Agriculture in Nitra, Faculty of Biotechnology and FoodSciences, Department of Chemistry, Tr A. Hlinku 2, 949 76 Nitra, Slovak Republic2Institute of Chemistry, Center of excellence for white-green biotechnology, Slovak Academy ofSciences, Trieda A.Hlinku 2, 94976 Nitra, Slovak Republic3Sl0vak Unive

3、rsity of Agriculture in Nitra5 Faculty of Agrobiology and Food Resources,Department of Poultry Science and Small Farm Animals, Tr. A. Hlinku 2, 949 76 Nitra, SlovakRepublic*Corresponding author: tomas.tothuniag.skABSTRACTFish meat is a perfect foodstuff which is up to standard of rational nourishmen

4、t. It issource of healthy and good digestible material rich on proteins, minerals and vitamins. Fishmuscles especially back and lateral muscles are the most important parts of fish organismconsumed for escellent chemical composition. Proteins in fish meat are rich on highaminoacids content. The cont

5、ent of fish fat is usually low with the high proportion ofunsaturated fatty acids. Also minerals and B, A and D vitamins are very importantcomponents of this fbodstuff. According to rational nourishment the fish meat should beconsumed minimal 2 times weekly. Our research was focused on analysis of b

6、ottomnsediments in water reservoir Kolinany from the aspect of Cd, Hg and Pb contents, thedetermination of observed heavy metal contents in different parts of carp body and theevaluation of hygienic status and suitability of fish meat for the human consumption. Ourresults have confirmed the hygienic

7、 wholcsomeness of bottom sediments in water reservoirKolinany The Cd, Pb and Hg contents in sediments represent no risk of their input into thefish organisms. The Cd content in fish meat was lower than maximal available amount givenby legislative norms, but in selected parts of fish organism such as

8、 skin, gills and fins the Cd837JMBFS / Toth et al. 2012 :1 (Februaty Special issue) 837-847hygienic limit is 2.9 - 6.6 times exceeded. The Pb content in fish meat was under the hygieniclimit, however in skin, gills and fins the content of this heavy metal was 1.31- 2.64 higherthan maximal legislativ

9、e given value. Fish skin, gills and fins belong to the non cosumedparts of fish body by people. The Hg content in fish meat was also lower than hygiene limit.The highest Hg content was observed in fish muscles (0.0544 mg.kg -) and the lowest one infish gonads (0.0058 mg.kg-). The results of Cd, Pb a

10、nd Hg content determination in carpbody confirmed that fish muscles belong to suitable foodstuffs for the human consumption.Keywords: cadmium, lead, mercury, fish, carp, food hygieneINTRODUCTIONWhile in last decades the concentration of various toxic and risky elements inenvironment has increased du

11、e to mans activities, it has caused the transfer of mentionedelements into food chain. Substantial issue is to monitor their entries into environment,especially in areas with highly developed industry (Toman et aL, 2003).Almost all of metals occur naturally in surface and also in ground waters. Many

12、 ofthem are essential for life in trace amounts, but in higher concentrations could act negatively.Hygienically serious issue includes metals with toxic properties that rank among the mostsubstantial inorganic contaminants of waters and soil (Dercova et aL, 2005).Mainly lead, cadmium and mercury ran

13、k among toxic metals occurring in waters. Oneof the significant negative properties of these metals is their ability to cumulate in sediments.Especially mercury has great ability to accumulate in aquatic organisms. Mercury passes fromwater into bottom sediments in flowing waters and dams, where it a

14、ccumulates mostly in theform of sulfhide Content of mercury in bottom sediments is in relation to level of burden ofkey locality, but also to character of sediment. Bottom sediments could be as suitableindicators of contamination of surface waters by lead and cadmium. Samples of sediment withbulk of

15、 mud and organic parts have in most cases higher content of mercury in comparison tosample of sandy character (Cibulka et al” 1991)Remarkable cumulating ability of sediments poses a source of eventual contaminationof fish meat by risky elements. The importance representation of fish in our diet has

16、beenproved by so-called Eskimo paradox. Diet of original inhabitants of Greenland - Eskimos hasconsisted only from products of animal kingdom. It comprises of fish and marine mammals,what means that it is very rich in animal proteins, lipids and cholesterol. It seemed almostincomprehensible why the Greenland Eskimos do not suffer from cardio-vascular