Zobrazeno 1 - 10
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pro vyhledávání: '"JOHN D. HEM"'
This chapter reviews the surface chemical behavior of aluminum oxides and hydroxides, with an emphasis on adsorption studies and the electrochemical behavior of the alumina–water interface. The coordination behavior of aluminum cation toward hydrox
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e26ea0210e649ec194dcad00ec50365
https://doi.org/10.1201/9780138736781-7
https://doi.org/10.1201/9780138736781-7
Autor:
John D. Hem, Charles E. Roberson
Publikováno v:
ACS Symposium Series ISBN: 9780841217294
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6df06ace0a08de7a5d9c3bf00c2755b
https://doi.org/10.1021/bk-1990-0416.ch033
https://doi.org/10.1021/bk-1990-0416.ch033
Autor:
John D. Hem
Publikováno v:
Geochimica et Cosmochimica Acta. 45:1369-1374
The rate of crystal growth of Mn3O4 (hausmannite) and βMnOOH (feitknechtite) in aerated aqueous manganous perchlorate systems, near 0.01 M in total manganese, was determined at pH levels ranging from 7.00 to 9.00 and at temperatures from 0.5 to 37.4
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d9e74a80e22e154295fbed6116ef8e1
https://doi.org/10.1016/0016-7037(81)90229-5
https://doi.org/10.1016/0016-7037(81)90229-5
Publikováno v:
Geochimica et Cosmochimica Acta. 53:2811-2822
Open-system, continuous-titration experiments have been done in which a slow flux of ∼0.02 molar solution of Mn2+ chloride, nitrate, or perchlorate with Cu2+ or Ni2+ in lesser concentrations was introduced into an aerated reactor solution held at c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd58a6c41e646343f2320cc042235f93
https://doi.org/10.1016/0016-7037(89)90159-2
https://doi.org/10.1016/0016-7037(89)90159-2
Publikováno v:
Geochimica et Cosmochimica Acta. 51:1539-1547
A precipitate of nearly pure hetaerolite, ZnMn 2 O 4 , a spinel-structured analog of hausmannite, Mn 3 O 4 , was prepared by an irreversible wprecipitation of zinc with manganese at 25°C. The synthesis technique entailed constant slow addition of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7282869500eb9c6d1957dd92129a12d9
https://doi.org/10.1016/0016-7037(87)90335-8
https://doi.org/10.1016/0016-7037(87)90335-8
Autor:
John D. Hem
Publikováno v:
Geochimica et Cosmochimica Acta. 40:599-609
The equilibrium distribution of lead in solution and adsorbed on cation exchange sites in sediment theoretically may be calculated from equations representing selectivities of substrate for lead over H+, Ca2+ and Na+, and the stabilities of lead solu
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https://doi.org/10.1016/0016-7037(76)90106-x
https://doi.org/10.1016/0016-7037(76)90106-x
Autor:
John D. Hem
Publikováno v:
Chemical Geology. 21:199-218
Mn oxides precipitated from aerated solutions of Mn 2+ by raising the pH are reported in various publications to have the approximate composition Mn 3 O 4 or MnOOH. These oxyhydroxides in turn can disproportionate to Mn 2+ and MnO 2 resulting in a su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::86796d873facf34bf4b4c966ca0732d6
https://doi.org/10.1016/0009-2541(78)90045-1
https://doi.org/10.1016/0009-2541(78)90045-1
Autor:
John D. Hem
Publikováno v:
Journal - American Water Works Association. 53:211-232
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a36ffbcbc4c874e7e5f9adf7cc460c21
https://doi.org/10.1002/j.1551-8833.1961.tb00653.x
https://doi.org/10.1002/j.1551-8833.1961.tb00653.x
Autor:
John D. Hem
Publikováno v:
International Association of Scientific Hydrology. Bulletin. 5:45-53
Chemical equilibrium in water in contact with calcite is expressed by means of a pH grid overlay on a log-log plot of activities of bicarbonate vs. calcium ions. Solubility of ferrous iron and the solid-phase minerals that would be stable in a soluti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7bfdf8021dc8dc6018b3d54c8b8fc512
https://doi.org/10.1080/02626666009493179
https://doi.org/10.1080/02626666009493179
Autor:
John D. Hem, C. E. Roberson
Publikováno v:
Geochimica et Cosmochimica Acta. 32:1343-1351
The activity product constant of cryolite (Na 3 AlF 6 ) at 25°C and 1 atm total pressure was calculated from data for solutions from which synthetic cryolite or mixtures of cryolite and a solid apparently related to ralstonite had precipitated. The
Externí odkaz:
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https://doi.org/10.1016/0016-7037(68)90033-1
https://doi.org/10.1016/0016-7037(68)90033-1