Cadmium terrestrial system

Mussels and fish are capable of taking in great amounts of copper, and may be a valuable nutritional source of that metal for humans (Han and Hung 1990). Copper is part of hemocuprein (hemocyanin), a constitutive prosthetic element in the respiratory system of squid, crabs, and some fishes, and is analogous to iron in hemoglobin (Frausto de Silva and Williams 1991). Fish absorb copper directly from water and accumulate it in greater amount than mercury, lead, and cadmium (Mount et al. 1994). Also, terrestrial Crustacea accumulate copper more then the littoral. 

As with azeotropes, eutectics maybe ternary, quaternary, and so on, but their phase diagrams get very complex very quickly. A few important eutectics have an impact on ordinary life. Ordinary solder is a eutectic of tin and lead (63% and 37%, respectively) that melts at 183 C, whereas the melting points of tin and lead are 232 C and 327 C. Wood s metal is an alloy of bismuth, lead, tin, and cadmium (50 25 12.5 12.5) that melts at 70 C (lower than the boiling point of water ) that can be used in overhead fire sprinkler systems. NaCl and H2O make a eutectic that melts at — 21 C, which should be of some interest to communities that use salt on icy roads in the winter. (The composition of this eutectic is about 23 weight percent NaCl.) An unusual eutectic exists for cesium and potassium. In a 77 23 ratio, this eutectic melts at —48 C This eutectic would be a liquid metal at most terrestrial temperatures (and be very reactive toward water). 

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