Ultraviolet spectra of metal ions in 6M hydrochloric acid

Goodkin, Louise

doi:10.1016/0039-9140(75)80062-2

Cited by 24 publications

(10 citation statements)

References 6 publications

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“…Rabinowitch also investigated absorption of Fe 2+ and Fe 3+ ions in aqueous phase and found that Fe 3+ is an order of magnitude stronger than Fe 2+ ; furthermore Fe 2+ does not absorb past 275 nm, while Fe 3+ does not absorb past 350 nm. Goodkin et al [22] recorded UV absorption spectra of metals dissolved in hydrochloric acid; they found that Fe 3+ absorption is relatively constant from 215 to 400 nm, unlike the result found by Rabinowitch. They also investigated the absorption of Mn 2+ , and found it to be two orders of magnitude smaller than Fe 3+ , though it does not absorb past 250 nm.…”

Section: Introductionmentioning

confidence: 92%

“…Anbar and Holland [20] investigated the UV attenuation of solutions containing NaCl, MnCl 2 , and FeCl 2 for terrestrial solar radiation. They used spectral information of Cl − , Mn 2+ , and Fe 2+ ions from Rabinowitch [21], Goodkin et al [22], and Heinrich and Seward [23], respectively. Rabinowitch found that anions, such as Cl − and SO 4 2Ϫ absorb strongly below 200 nm, but have very little absorption above 200 nm [21].…”

Section: Introductionmentioning

confidence: 99%

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UV attenuation by Martian brines

et al. 2020

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UV radiation on the surface of Mars is an important factor affecting the survivability of microorganisms on Mars; a habitable niche on Mars would be one that provides protection from harmful UV radiation. The possibility of Martian brines providing a habitable niche on Mars via attenuation of UV radiation is investigated. Minerals could have leached into bodies of water on early Mars and may remain present in the polar ice caps. Aqueous solutions of nine different salts found on the surface of Mars were prepared and UV absorption cross sections were derived in the spectral range 230–400 nm. The salts investigated were Fe(NO3)3, Fe2(SO4)3, FeSO4, FeCl2, MnSO4, CaSO4, MgSO4, MgCl2, and NaCl. UV absorption cross sections found ranged from 10−24 to 10−17 cm2molecule−1, with the cation primarily affecting absorption strength. In particular, salts containing Fe3+ were found to absorb significant amounts of UV radiation. Combining the derived absorption cross sections with the solar radiation at Mars, transmitted UV radiation was simulated for different combinations of depth and salt concentration. Greater than 95% UV absorption from 230 to 400 nm is possible with iron salts at depths and concentrations expected to be found on past and present-day Mars. The results of this work are promising for investigating the habitability of Mars and other rocky planets that lack an atmosphere capable of attenuating UV radiation.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

UV attenuation by Martian brines

et al. 2020

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“…Polyethylene glycol (PEG 400), 0.5% vjv, was added to solubilize the reagent and its complexes. Silver(I), bismuth(III), mercury(II), antimony(III), tin(IV), and arsenic(II1) were detected at 225 nm using 2-12 M hydrochloric acid in the dye circuit (6). The first four ions mere adequately detected with 2 M hydrochloric acid, but tin(IV), and particularly arsenic(II1).…”

Section: Methodsmentioning

confidence: 99%

Chromatography of metal ions with thioglycolate chelating resin

Phillips¹,

Fritz²

1978

Anal. Chem.

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The synthesis and properties of a chelating resin containing a thioglycoloyloxymethyl functional group are described. This resin retains silver( I ) , bismuth( 111), tin( I V ) , antimony(III), mercury( 11), and gold( 111) from 0.1 M acid and cadmium( 11), lead(II), and uranium(V1) from pH 3.5 solution. On a column containing this resin, separations of several of these metal ions are obtained by elution with acetate and hydrochloric acid eluents. Application to real samples is demonstrated by the successful analysis of NBS samples for antimony, and of acidic brine solutions for traces of mercury( 11).Recent work has shown that chelating ion-exchange resins can be synthesized that are highly selective for certain groups of metal ions (1-4). The resins can be used to concentrate certain metal ions from aqueous solution and for columnchromatographic separations. The hexylthioglycolate resin developed by Moyers and Fritz ( 1 ) has been shown to be specific for silver(I), mercury(II), bismuth(III), and gold(II1) in 0.1 M acid. This resin is a diester formed by stepwise reactions of l,&hexanediol and thioglycolic acid with a carboxylic acid group on XAD-4, a macroporous styrenedivinylbenzene copolymer. The synthesis involves several steps and the final resin contains unreacted carboxyl groups which impart general ion-exchange properties. Thus, the hexylthioglycolate resin exhibits strong selectivity toward metal ions only in highly acidic solutions. This paper reports the synthesis and analytical applications of a resin containing the thioglycoloyloxymethyl chelating group (-CH20CO-CH2SH) attached to the benzene ring of a polystyreneDVI3 resin. Synthesis of this resin is more direct than that of the hexylthioglycolate resin, and the new resin is useful both in strongly acidic and in less acidic aqueous solutions. We report the retention behavior of a number of cations in acetate buffers, and demonstrate the separation of zinc(II), cadmium(II), and lead(I1). In addition, the retention behavior of silver(I), bismuth(II1). mercury(II), tin(IV), and antimony(II1) in hydrochloric acid is described. The results are compared with those of Moyers and Fritz using the hexylthioglycolate resin. Analytical applications are demonstrated by analyzing NBS standards for antimony and a simulated chlor-alkali brine for mercury(I1) using liquid chromatography with automatic detection. EXPERIMENTALLiquid Chromatograph. The system for liquid chromatography with automatic detection has been described previously ( 3 ) . Sample loops of 50, 200, or 1000 pL were used depending on the concentration of the ion of interest. A 10 cm by 2 mm i.d. column was used for the separation of zinc, cadmium, and lead and a 5 cm by 2 mm i.d. column was used for separations involving antimony, bismuth, and mercury. The resin used in these columns was taken from the <200 mesh fraction after grinding and sieving. It was slurried with methanol, allowed to settle, and the unsettled fines were decanted. This fractionation process was repeated several times after th...

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“…The absorbance of metal chloride complexes in the ultraviolet spectral region has been used extensively to automatically detect metal ions in liquid chromatography [27][28][29][30]. The absorption wavelength maxima of the metal chloride complexes are shown in Table 4.3.…”

Section: Direct Spectrophotometric Measurementmentioning

confidence: 99%

Detectors

2009

Ion Chromatography

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71 Conductivity Detectorsanion-exchange column (with a high pH eluent), it is only possible to detect the stronger acid, arsenate, by suppressed conductivity, and is not possible to detect the weak acid, arsenite. Other anions that cannot be detected by suppressed conductivity detection include borate, silicate and cyanide. Nonsuppressed, single-column methods, selective detection, or post-column reaction methods are required for the detection of salts of weak acids. Table 4.1 Limiting equivalent ionic conductances in aqueous solution at 25°C. (Units: S cm 2 equiv -1 ) Anions k -Cations k +

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Ultraviolet spectra of metal ions in 6M hydrochloric acid

Cited by 24 publications

References 6 publications

UV attenuation by Martian brines

UV attenuation by Martian brines

Chromatography of metal ions with thioglycolate chelating resin

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