By John H. Steele, Karl K. Turekian, Steve A. Thorpe

Marine Chemistry and Geochemistry is a by-product of the Encyclopedia of Ocean Sciences, second variation and serves as a tremendous reference on present wisdom and services in a single handy and obtainable source. The chosen articles-all written through specialists of their field-fall into a number of different types, including: chemistry of sea water, tracers within the sea, natural radioactive species within the ocean, cycles of the nuclides, marine deposits and air sea exchanges. Marine Chemistry and Geochemistry serves as a great reference for topical learn. References comparable articles on marine chemistry and geochemistry to facilitate extra researchRichly illustrated with figures and tables that relief in realizing key conceptsIncludes an introductory evaluation of marine chemistry and geochemistry after which explores each one subject intimately, making it worthwhile to specialists and graduate-level researchersTopical association makes it the appropriate table reference

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Indian Ocean data (Levassuer et al. 1998 Science 282: 272) indicate that Os behaves conservatively. PLATINUM GROUP ELEMENTS AND THEIR ISOTOPES IN THE OCEAN 2 33 34 PLATINUM GROUP ELEMENTS AND THEIR ISOTOPES IN THE OCEAN 50 Depth (m) 187 Range of measured concentration in the open ocean (n= 5) 0 100 150 200 250 0 1 2 3 4 5 6 7 Ir (fmol kg_1) Figure 4 Dissolved Ir profile from the Baltic Sea plotted with the range of Ir concentrations reported for analyses of open ocean samples. Baltic Sea samples were filtered prior to acidification, open-ocean data were acidified and unfiltered.

This concentration contrast results from the fact that the PGEs are retained in the solid residue when the deep earth is melted to form the earth’s crust. 5 a Values from McDonough and Sun (1995) Chem. Geol. 120 p. 223. Values from Schmidt et al. (1997) Geochim. Cosmochim. Act. 61 p. 2977. c Seawater/crust ¼ (row 4)/(row 3) as a dimensionless ratio. b 29 30 PLATINUM GROUP ELEMENTS AND THEIR ISOTOPES IN THE OCEAN Very insoluble Very soluble Sn Pb Pr Zr Y La Dy Si Nd Ho Au Pd Sm Er Cu Pt Eu Tm Ir Tl Ag Rb Rh U I Na Sc Co Yb Ru Ge Ba W Os F Li Ca S Ce Gd Lu Ga Cr V P Cd As Mo K Mg Cl Fe Th Al Be Tb Mn In Zn Ni Cs Bi Sb Se Re Sr B Br Ti _9 _8 _7 _6 _5 _4 _3 _2 _1 0 Log (average deep water concentration/average upper crustal concentration) Figure 1 Histogram of seawater/upper crust partition coefficients.

Mn(II), Mn(III), Mn(IV) Manganese with oxidation states of þ 2, þ 3, and þ 4, respectively. NADPH The reduced form of nicotinamide adenine dinucleotide phosphate, which is produced in photosynthesis and serves as the primary reductant molecule in plant cells. Nitrogenase An iron-containing enzyme complex responsible for nitrogen fixation. Photosystem I and photosystem II The two photochemical reaction centers in photosynthesis. Redox Chemical reduction and oxidation. Siderophore A high-affinity organic ligand produced by bacteria to complex iron and facilitate its intracellular uptake.

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