Die Eigenschaften von Manganverbindungen
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Unterrichtsentwurf aus dem Jahr 2002 im Fachbereich Didaktik - Chemie, Note: 2,0, Ruprecht-Karls-Universit�t Heidelberg (Chemisches Institut), Veranstaltung: Demonstrationskurs, Sprache: Deutsch, Abstract: Mangan ist in der Natur recht verbreitet. Es hat ungef�hr 0,09% Anteil am Aufbau der festen Erdrinde. Damit ist es ebenso h�ufig vertreten wie etwa der Kohlenstoff oder Phosphor. Nach Eisen und Titan ist Mangan das dritth�ufigste �bergangselement. Nat�rlich vorkommendes Mangan findet man meist als Oxidverbindungen, wie zum Beispiel Braunstein (MnO2), Braunit (Mn2O3), oder Hausmannit (Mn3O4). Meist finden sich diese Erze in Gesellschaft von Eisenerzen. Reiche Lagerst�tten liegen an der Ostk�ste des Schwarzen Meeres, in Indien, in Brasilien, in Australien in China und in S�dafrika. Gro e Mengen von Mangan finden sich in der Tiefsee, in den Manganknollen, die 15-20% Mangan, ferner Eisen und kleinere Mengen Cobalt, Nickel und Kupfer enthalten. Doch auch f�r uns Menschen ist Mangan wichtig! Es ist ein essentielles Spurenelement, das in allen lebenden Zellen vorkommt. Der menschliche K�rper enth�lt 0,3 mg pro kg (Zelle und Knochen) und sollte mindestens 3 mg Mangan aufnehmen (Vollkornprodukte, N�sse, Keimlinge, Kakao). Mangan ist in vielen Enzymen enthalten und z.B. zum Aufbau von Cholesterin beteiligt. Manganmangel ruft unter anderem Sterilit�t hervor. Mangan�berschu f�hrt zur Reizung der Atemwege, der Haut und schlie lich zu Sch�digungen des Nervensystems, mit Sprach- und Bewegungsst�rungen (=Manganismus) Pflanzen ben�tigen Mangan bei der Photosynthese. Manganmangel bewirkt hier eine Minderung des Wachstums.
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