scholarly journals Effect of novel dithiooctanoate monomers, in comparison with various sulfur-containing adhesive monomers, on adhesion to precious metals and alloys

2011 ◽  
Vol 30 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Kunio IKEMURA ◽  
Katsunori KOJIMA ◽  
Takeshi ENDO ◽  
Yoshinori KADOMA
Keyword(s):  
Precious Metals ◽  
Metals And Alloys ◽  
Sulfur Containing

Properties of low power spark ablation in aqueous solution for dissolution of precious metals and alloys

2006 ◽  
Vol 61 (7) ◽  
pp. 817-823 ◽  
Author(s):  
Douglas Goltz ◽  
Michael Boileau ◽  
Ian Plews ◽  
Kimberly Charleton ◽  
Michael W. Hinds
Keyword(s):  
Aqueous Solution ◽  
Low Power ◽  
Precious Metals ◽  
Metals And Alloys

scholarly journals Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 481
Author(s):  
Vladimir Losev ◽  
Evgeney Elsuf’ev ◽  
Elena Borodina ◽  
Olga Buyko ◽  
Natalya Maznyak ◽  
...  
Keyword(s):  
Certified Reference Materials ◽  
Precious Metals ◽  
Substitution Reactions ◽  
Thiourea Derivatives ◽  
Chemically Modified ◽  
Dipropyl Disulfide ◽  
Separation And Preconcentration ◽  
High Concentrations ◽  
Precious Metal Ions ◽  
Sulfur Containing

Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation and preconcentration of precious metals. These adsorbents quantitatively extracted precious metals from 0.5 to 4 M solutions of hydrochloric acid. It allowed their separation from high concentrations of non-ferrous, alkaline earth, alkali and some other related metals. The selectivity of separation of kinetically labile precious metal ions in ligand substitution reactions from kinetically inert ones depended on the nature of sulfur atom within the functional group of adsorbents and increased when passing from thione to thiol sulfur. Approaches for the preconcentration of precious metals using silicas chemically modified with sulfur-containing groups prior to their AAS, ICP-OES, and ICP-MS determination in ores, concentrates and their processing products were proposed. The correctness of the developed methods was confirmed by the analysis of certified reference materials.

scholarly journals Preconcentration And Determination Of Precious Metals Using Silica Gel Chemically Modified With Products Of Interaction Of O- or p-Aminotiophenols With g-(Trietoxisilane)Propylisocyanate

2020 ◽  
Vol 15 (2) ◽  
pp. 53-56
Author(s):  
A.K. Trofimchuk ◽  
V.N. Losev ◽  
V.V. V.V. ◽  
E.V. Elsuf’ev ◽  
N.V. Gudymа
Keyword(s):  
Precious Metals ◽  
Silica Gels ◽  
Luminescence Spectroscopy ◽  
Surface Complexes ◽  
Chemically Modified ◽  
Gold Silver ◽  
Lower Oxidation ◽  
Sulfur Containing ◽  
Better Than

The synthesis of new complexing adsorbents with thiophenol (MPhS) and aminobenzthiazolpropyl (ABTS) groups grafted onto the surface of silica gels are considered. The extraction of precious metals (Au(III), Ag(I), Pd(II), Pt(II,IV), Rh(III), Ir(IV), Ru(IV), Os(IV)) from solutions of hydrochloric acid by MPhS and ABTS adsorbents. Contact time, acidity, temperature (25 – 95 °C), and the presence of a labilization agent tin(II) chloride is examined. It is shown that the adsorption properties of MPhS for precious metals are better than ABTS. It was proved by luminescence spectroscopy that gold, silver and platinum in the surface complexes with sulfur-containing groups are in lower oxidation states; and by the EPR method it was proved that ruthenium and osmium in surface complexes are in oxidation state +3. The formation of luminescent Ag(I), Au(I) and Pt(II) complexes on the surface of the MPhS, colored Ru(III) complexes on the surface of MPhS and ABTS, and mixed-ligand complexes of Pt(II) with surface aminobenzthiazole groups and Michler’s thioketone were used for developing methods of their adsorption luminescent, adsorption-photometric and test determinatio

scholarly journals The Essential Steps to Buying an Engagement Ring

2021 ◽  
Vol 1 (2) ◽  
pp. 41-45
Author(s):  
Adhiraj Singh Devra ◽  
◽  
Shanane Davis
Keyword(s):  
Precious Metal ◽  
Precious Metals ◽  
Metals And Alloys ◽  
Fuzzy Like

Your partner is a rarity inside and out, and you want an engagement ring worthy of them, but while you know your beloved, you know little if anything about precious metal and gems. this article is help you with a step-by-step guide to finding the ring that is right for them and that will shine with your love for the rest of your lives. In what follows, we break it down for you from the fuzzy, like how to find out what your partner really wants, to the technical, like how a gemstone is valued and graded in the marketplace and which precious metals and alloys are best for a lifetime of beauty and wear.

Selective Adsorption of Precious Metals on Sulfur-Containing Chitosan Derivatives

1994 ◽  
Vol 23 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Yoshinari Baba ◽  
Hiroyuki Hirakawa ◽  
Yoshinobu Kawano
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Chitosan Derivatives ◽  
Sulfur Containing

Al-Khazini’s Balance of Wisdom

Nuncius ◽  
2020 ◽  
pp. 1-18
Author(s):  
Yousef Yassi ◽  
Reza Yassi
Keyword(s):  
Binary Alloy ◽  
Precious Metals ◽  
Metals And Alloys ◽  
Islamic World ◽  
Pure Metals ◽  
Constituent Elements ◽  
High Degree

Abstract Abu al-Fath Khazini’s “Balance of Wisdom” was one of the most sophisticated and advanced balances to be designed and manufactured in the medieval Islamic world. Hydrostatic balances were used to assess the value of the precious metals and gemstones entering the royal treasury. Al-Khazini presents a detailed description of his balance in Al-Kitab Mizan Al-Hikma. Among the advantages of this instrument were its higher degree of precision, its complex triple action, and its ability to identify and determine the percentage by weight of the constituent elements in a binary alloy, provided one of the elements in the alloy is known. It was also capable of measuring the weight and density of pure metals and alloys with a high degree of accuracy. This paper describes the construction of a prototype of Al-Khazini’s balance and the testing of its accuracy in weighing, titration, and the identification of elements following the instructions contained in Al-Kitab Mizan Al-Hikma. The instrument was found to function as accurately as claimed by its inventor.

Methionine-Specific Staining of Collagen

1982 ◽  
Vol 40 ◽  
pp. 294-295
Author(s):  
E.M. Kuhn ◽  
K.D. Marenus ◽  
M. Beer
Keyword(s):  
Amino Acids ◽  
Collagen Fibers ◽  
Type Iii Collagen ◽  
Type I ◽  
Electron Microscopic ◽  
Good Correspondence ◽  
Specific Staining ◽  
Type Iii ◽  
Different Types ◽  
Sulfur Containing

Fibers composed of different types of collagen cannot be differentiated by conventional electron microscopic stains. We are developing staining procedures aimed at identifying collagen fibers of different types.Pt(Gly-L-Met)Cl binds specifically to sulfur-containing amino acids. Different collagens have methionine (met) residues at somewhat different positions. A good correspondence has been reported between known met positions and Pt(GLM) bands in rat Type I SLS (collagen aggregates in which molecules lie adjacent to each other in exact register). We have confirmed this relationship in Type III collagen SLS (Fig. 1).

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