@article {7020, title = {Chemically modified electrode for the determination of gold - an electrochemical and spectrophotometric study.}, journal = {Fresenius{\textquoteright} J. Anal. Chem.Fresenius{\textquoteright} Journal of Analytical Chemistry}, volume = {349}, number = {7}, year = {1994}, note = {CAPLUS AN 1994:670642(Journal)}, month = {1994///}, pages = {491 - 6}, abstract = {The voltammetric detn. of trace amts. of gold was studied using a chem. modified electrode. The role played by the host mol. attached to a glassy carbon electrode (GCE), i.e. 8,9,17,18-dibenzo-1,7-dioxa-10,13,16-triazacyclooctadecane (DDTC), was examd. by electrochem. and spectrochem. techniques. Cathodic stripping voltammetry (CSV) was applied to study the various parameters affecting the affinity of gold ions by a DDTC modified electrode as well as the interferences by other ions. Finally, the method was successfully applied to det. gold traces in a geol. sample. In addn., the formation of an AuCl4--DDTC complex was followed and its formation const. was detd. by spectrophotometry. [on SciFinder(R)]}, keywords = {aza crown ether modified electrode gold, cathodic stripping voltammetry gold detn, geol analysis gold cathodic stripping voltammetry, gold detn chem modified electrode}, isbn = {0937-0633}, author = {Turyan, Iva and Mandler, Daniel.} } @article {7021, title = {Deposition of nickel hydroxide structures using the scanning electrochemical microscope.}, journal = {J. Electrochem. Soc.Journal of the Electrochemical Society}, volume = {141}, number = {4}, year = {1994}, note = {CAPLUS AN 1994:283075(Journal)}, month = {1994///}, pages = {995 - 9}, abstract = {The scanning electrochem. microscope was applied to drive the deposition of Ni(OH)2 structures. Nickel hydroxide was deposited from aq. solns. onto platinum surfaces as a result of changing the pH locally on the electrode surface. The increase in pH is driven by an oxidn.-redn. process, i.e., N,N{\textquoteright}-dimethyl-4,4{\textquoteright}-bipyridinium, MV2+, which is reduced at an ultramicroelectrode, diffuses to the surface where it is regenerated upon the redn. of protons, causing a local increase of pH and the deposition of Ni(OH)2. The different parameters that control the efficiency of the deposition, such as the pH and the concn. of the buffer, were examd. [on SciFinder(R)]}, keywords = {deposition hydroxide pH hydrogen ion redn, methyl viologen redox pH hydroxide deposition, nickel hydroxide electrodeposition electrochem scanning microscope, platinum microelectrode nickel hydroxide deposition pattern}, isbn = {0013-4651}, author = {Shohat, Ilan and Mandler, Daniel.} } @article {7019, title = {Electrochemical determination of ultralow levels (, keywords = {body fluid mercury detn, mercury detn anodic stripping voltammetry electrode, water mercury detn}, isbn = {1040-0397}, author = {Turyan, Iva and Mandler, Daniel.} } @article {7022, title = {Self-assembled monolayers in electroanalytical chemistry: Application of ω-mercaptocarboxylic acid monolayers for electrochemical determination of ultralow levels of cadmium(II).}, journal = {Anal. Chem.Analytical Chemistry}, volume = {66}, number = {1}, year = {1994}, note = {CAPLUS AN 1994:44681(Journal)}, month = {1994///}, pages = {58 - 63}, abstract = {Self-assembled monolayers of ω-mercaptocarboxylic acids, HS(CH2)nCO2H (n = 1, 2, 5, 10), on mercury film (MF) and gold electrodes have been used for the very sensitive and selective anal. of ultralow levels of cadmium(II). The authors find that shorter ω-mercaptocarboxylic acids provide superior sensitivity. Other parameters that govern the sensitivity and selectivity of this system have been examd. in detail. Optimizing these factors resulted in a detection limit of 4 {\texttimes} 10-12 M (0.45 ppt). The method has been verified by detg. cadmium in std. solns. and it has been successfully applied to the anal. of cadmium in seawater. [on SciFinder(R)]}, keywords = {cadmium detn mercaptocarboxylic acid modified electrode, gold mercaptocarboxylic acid modified electrode cadmium, mercury film mercaptocarboxylic acid modified electrode, water analysis cadmium mercaptocarboxylic acid electrode}, isbn = {0003-2700}, author = {Turyan, Iva and Mandler, Daniel.} }