Zobrazeno 1 - 10
of 39
pro vyhledávání: '"John David Hem"'
Autor:
Carol J. Lind, John David Hem
Publikováno v:
Geochimica et Cosmochimica Acta. 58:1601-1613
Groundwater underlying the valley of Pinal Creek downstream from Globe, Arizona, has been contaminated by low-pH metal-enriched wastewater from copper mining and ore processing at Miami, Arizona. At present, the acidity and most of the dissolved meta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::296aef2f1b6098bcbac49602be99b8c0
https://doi.org/10.1016/0016-7037(94)90562-2
https://doi.org/10.1016/0016-7037(94)90562-2
Autor:
Carol J. Lind, John David Hem
Publikováno v:
Applied Geochemistry. 8:67-80
The Pinal creek drainage basin in Arizona is a good example of the principal non-coal source of mining-related acid drainage in the U.S.A., namely copper mining. Infiltration of drainage waters from mining and ore refining has created an acid groundw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85a2f0dc7bd98ab7769938ee83663ae5
https://doi.org/10.1016/0883-2927(93)90057-n
https://doi.org/10.1016/0883-2927(93)90057-n
Autor:
Carol J. Lind, John David Hem
Publikováno v:
Geochimica et Cosmochimica Acta. 55:2435-2451
Manganese oxidation products were precipitated in an aerated open-aqueous system where a continuous influx of mixed Mn 2+ and Cd 2+ solution was supplied and pH was maintained with an automated pH-stat adding dilute NaOH. X-ray diffraction and electr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::625f349618257134b0adcd2557fc78a4
https://doi.org/10.1016/0016-7037(91)90364-b
https://doi.org/10.1016/0016-7037(91)90364-b
Autor:
John David Hem
Publikováno v:
Kirk-Othmer Encyclopedia of Chemical Technology
Factors affecting stream quality and general principles of stream water geochemistry are given. Ideally, water is controlled by the alteration of rock minerals through chemical weathering processes, which liberate soluble products. These processes ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da8a781256b0e3feb68b0fdbd3ef0b83
https://doi.org/10.1002/0471238961.19152118080513.a01
https://doi.org/10.1002/0471238961.19152118080513.a01
Autor:
John David Hem
Publikováno v:
Geochimica et Cosmochimica Acta. 57:5013
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70fd9bb3e38ec5f084c349b9b99b92e4
https://doi.org/10.1016/s0016-7037(05)80009-2
https://doi.org/10.1016/s0016-7037(05)80009-2
Publikováno v:
Geochimica et Cosmochimica Acta. 49:801-810
A precipitate of cobalt oxyhydroxides formed by bubbling oxygen through a dilute solution of Co(NO3)2 held at pH 9.0 and 25°C was aged for 23 months in contact with the original solution, with access to atmospheric oxygen. Co3O4 and CoOOH were ident
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::02e8035eec8d5e62ceded1cbefce2b06
https://doi.org/10.1016/0016-7037(85)90173-5
https://doi.org/10.1016/0016-7037(85)90173-5
Autor:
John David Hem, Carol J. Lind
Publikováno v:
Geochimica et Cosmochimica Acta. 47:2037-2046
Manganese oxides precipitated by bubbling air through 0.01 molar solutions of MnCl 2 , Mn(NO 3 ) 2 , MnSO 4 , or Mn(ClO 4 ) 2 at a constantly maintained pH of 8.5 to 9.5 at temperatures of 25°C or higher consisted mainly of hausmannite, Mn 3 O 4 . A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de7dd891b43d4ada2c674c860aa2f2fd
https://doi.org/10.1016/0016-7037(83)90219-3
https://doi.org/10.1016/0016-7037(83)90219-3
Autor:
John David Hem
Publikováno v:
Economic Geology. 45:72-81
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad653a398353972e504c831f6e3f22bc
https://doi.org/10.2113/gsecongeo.45.1.72
https://doi.org/10.2113/gsecongeo.45.1.72
Autor:
John David Hem, Carol J. Lind
Publikováno v:
Science. 184:1171-1173
The addition of quercetin, an organic flavone (C 15 H 10 O 7 ), to aqueous solutions containing silica and aluminum and adjusted to final p H9s from 6.5 to 8.5 produced a 1 : 1 alumninosilicate precipitate which, after 6 to 16 months of aging in solu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dfcb59fe0e3237c4361ed8d3f0a20f5c
https://doi.org/10.1126/science.184.4142.1171
https://doi.org/10.1126/science.184.4142.1171