MercuryElectrode

MercuryElectrode [OSWdf78745ef9db483088f08ce074fcb8ff]
ID	OSWdf78745ef9db483088f08ce074fcb8ff
UUID	df78745e-f9db-4830-88f0-8ce074fcb8ff
Label	MercuryElectrode
Machine compatible name	MercuryElectrode
Statements (outgoing)

Statements (incoming)

Description

Liquid metal electrode used in polarography.

Item
Type(s)/Category(s)	EmmoTerm

Term

EmmoTerm
Comment	A mercury film electrode (MFE) or thin mercury film electrode (TMFE) is formed by coating a conducting substrate, usually glassy carbon, with a layer of mercury (thin film, amalgam, or array of microdrops), often by electrodeposition from a solution containing Hg(II). The electrode area is normally in the range of 0.1 to 0.5 cm2 and mercury film thickness typically ranges from 10 to 1000 nm, producing a film of large surface area-to-volume ratio that results in a high analyte pre-concentration during the deposition step of anodic stripping voltammetry. Compared to an HMDE, the MFE provides high sensitivity and resolution; however, it is somewhat less reproducible and more prone to interferences from intermetallic formation and surface-active substances. [en] Liquid mercury is an ideal electrode material for negative potentials because of its high overpotential for hydrogen evolution (electrochemical reduction of hydroxonium cations from solution). However, mercury is readily oxidized, particularly in the presence of anions that form complexes or that pre- cipitate with Hg(I) or Hg(II) ions, and thus it is not suitable for use at positive potentials. The use of liquid mercury has largely been discontinued because of concerns about the toxicity of the element and its compounds. [en]
Superclass	MetalElectrode
Alternative label	HgElectrode [en]
URI	http://emmo.info/electrochemistry#electrochemistry_df78745e_f9db_4830_88f0_8ce074fcb8ff

jsondata

uuid

"df78745e-f9db-4830-88f0-8ce074fcb8ff"

name

"MercuryElectrode"

label

text	"MercuryElectrode"
lang	"en"

description

text	"Liquid metal electrode used in polarography."
lang	"en"

type

"Category:OSW57beed5e1294434ba77bb6516e461456"

uri

"http://emmo.info/electrochemistry#electrochemistry_df78745e_f9db_4830_88f0_8ce074fcb8ff"

altLabel

text	"HgElectrode"
lang	"en"

comment

text

"A mercury film electrode (MFE) or thin mercury film electrode (TMFE) is formed by coating a conducting substrate, usually glassy carbon, with a layer of mercury (thin film, amalgam, or array of microdrops), often by electrodeposition from a solution containing Hg(II). The electrode area is normally in the range of 0.1 to 0.5 cm2 and mercury film thickness typically ranges from 10 to 1000 nm, producing a film of large surface area-to-volume ratio that results in a high analyte pre-concentration during the deposition step of anodic stripping voltammetry. Compared to an HMDE, the MFE provides high sensitivity and resolution; however, it is somewhat less reproducible and more prone to interferences from intermetallic formation and surface-active substances."

lang

"en"

text

"Liquid mercury is an ideal electrode material for negative potentials because of its high overpotential for hydrogen evolution (electrochemical reduction of hydroxonium cations from solution). However, mercury is readily oxidized, particularly in the presence of anions that form complexes or that pre- cipitate with Hg(I) or Hg(II) ions, and thus it is not suitable for use at positive potentials. The use of liquid mercury has largely been discontinued because of concerns about the toxicity of the element and its compounds."

lang

"en"

subClassOf

"http://emmo.info/electrochemistry#electrochemistry_5adb91e0_ffe1_41f3_b779_c6966f65fb0e"

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