Determination of iron in seawater using cathodic stripping voltammetry preceded by adsorptive collection with the hanging mercury drop electrode

Berg, Constant M.G. van den; Huang, Zi Qiang

doi:10.1016/0022-0728(84)80228-4

Cited by 105 publications

(21 citation statements)

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“…In the presented studies, adsorptive stripping voltammetry with catechol as a complexing agent was used for iron determination, whereas reference measurements were carried out by ET-AAS. The method employing catechol was used to determine iron in a wide range of samples: seawater [6], wine [7], osteoblast-like cell culture medium [8], and simulated PWR coolant [9]. Among other complexing agents used for iron determinations which utilize AdSV methods, the following ones should be listed: 1-nitroso-2-naphthol [10,11], solochrome violet RS [12].…”

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confidence: 99%

Application of Adsorptive Stripping Voltammetry for Iron Determination with Catechol in Quartz and Silica Glass Samples

Gawryś¹,

Golimowski

1999

Electroanalysis

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A procedure for iron determination in quartz and silica glass materials based on adsorptive stripping voltammetry (AdSV) in the presence of catechol is described. Hanging mercury drop electrode as a working electrode was used. The optimized conditions include pH 7.1, accumulation potential À0.1 V, accumulation time 60 s, scan rate 10 mV s À1, pulse amplitude 25 mV. In case of 60 s accumulation time the obtained detection limit was 2. 2 mg L À1 Fe. The possibility of simultaneous determination of iron and copper in the same solution is shown. ET-AAS technique was applied as a reference method to AdSV measurements.Keywords: Adsorptive stripping voltammetry, Iron, Catechol, Quartz, Silica glass Silica glass is a high purity product containing 99.9 % of silica and even the content of impurities at ppm level can change its optical properties remarkably. Therefore the quality of the raw materials used in its production is of great importance. Within a group of natural materials quartz crystals ®nd the most frequent use. Typical iron content in natural quartz ranges from fractions of ppm to several ppm.Synthetic silica glass practically does not contain any impurities, and for this reason it is transparent for UV radiation up from 180 nm. In case of the silica glass obtained from natural materials this threshold is shifted towards longer waves. This shift as well as the decrease in UV radiation transmittance are generally attributed to iron ions [1]. The absorption of UV radiation by iron ions is probably caused by the absorption bands speci®c for this element (d±d electron transitions). The higher the iron content, the more evident these effects become [2].There are two kinds of analytical methods used for iron determination in quartz and silica glass samples, the ones without a decomposition step and the others requiring sample decomposition. In the ®rst group of methods XRF technique is widely used. Yet, the high detection limit of this method restricts its applications. In the second group, iron content can be measured by means of AAS or spectrophotometric methods. The variation of AAS method which involves sample feeding in form of à slurry' has gained much attention among analytical chemists in the recent years [3,4]. Application of voltammetric stripping techniques for iron determination in quartz or silica glass samples has not been found in the literature. However, AdSV method was applied to determination of titanium in quartz samples [5]. In the presented studies, adsorptive stripping voltammetry with catechol as a complexing agent was used for iron determination, whereas reference measurements were carried out by ET-AAS. The method employing catechol was used to determine iron in a wide range of samples: seawater [6], wine [7], osteoblast-like cell culture medium [8], and simulated PWR coolant [9]. Among other complexing agents used for iron determinations which utilize AdSV methods, the following ones should be listed: 1-nitroso-2-naphthol [10, 11], solochrome violet RS [12].The aim of this article w...

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confidence: 99%

Application of Adsorptive Stripping Voltammetry for Iron Determination with Catechol in Quartz and Silica Glass Samples

Gawryś¹,

Golimowski

1999

Electroanalysis

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“…The CSV peak height of iron increased with the pH between 7.3 and ca. 8.5 as already has been reported by Torrance et al [33] and for higher values of pH, the reduction current decreases possibly caused by competitive hydrolysis of the Fe3+ ions [16]. It was found also that the peak potential was strongly affected by the pH: a shift in a more negative direction of ca.…”

Section: Ph and Buffermentioning

confidence: 54%

“…As reported previously in the literature, low levels of iron, in the nanomolar range, can be determined using a chelating agent such as catechol [16], Solochrome Violet RS [I71 or I-nitroso-2-naphthol [IS]. The procedure developed by the van den Berg's group [I61 for determination of iron in sea water using catechol was selected since it enabled us to quantify total iron content (in contrast with Solochrome Violet RS) and the limit of detection was adequate.…”

Section: Resultsmentioning

confidence: 99%

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Iron determination in osteoblast‐like cell culture medium by adsorptive cathodic stripping voltammetry with a mercury microelectrode

Morais¹,

Carvalho²,

Sousa³

1997

Electroanalysis

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Mercury film microelectrodes were used to determine iron in osteoblast-like cell culture medium by performing adsorptive cathodic stripping voltammetry in the presence of catechol. The optimized analytical conditions are a catechol concentration of 5 . 0 0~ mol L-', pH 8.0 and a collection potential of -1.80 V which eliminates the copper interference. The reoxidation period was limited to the time between switching to -0.10 V and scanning up to the metal peak (ca. -0.40 V). The limit of detection obtained for a 30 s collection time was 1.93 x lo-* rnol L-' iron.The results achieved by this procedure and using the square-wave voltammetry technique are accurate and precise. Biological assays were performed to evaluate the mineralization process.

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“…Adsorptive stripping voltammetry provides a highly sensitive route to the measurement of numerous important trace metals that are not accessible to conventional stripping measurements due to the electrolytic nature of the preconcentration step [4]. Trace iron is one of the typical metals that cannot be quantified by conventional ASV method scheme due to its extreme redox potential, low solubility in mercury, and formation of intermetallic compounds with zinc and manganese [5].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Iron, Copper, and Cadmium by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

2007

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A novel, sensitive and selective adsorptive stripping procedure for simultaneous determination of iron, copper and cadmium is presented. The method is based on the adsorptive accumulation of thymolphthalexone (TPN) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. The influences of control variables on the sensitivity of the proposed method for the simultaneous determination of iron, copper and cadmium were studied using the Derringer desirability function. The optimum analytical conditions were found to be TPN concentration of 2.0 mM, pH of 9.5, and accumulation potential at À 0.4 V vs. Ag/AgCl with an accumulation time of 60 s. The peak currents are proportional to the concentration of iron, copper and cadmium over the 1 -80, 0.5 -100 and 1 -100 ng mL À1 ranges with detection limits of 0.5, 0.4 and 0.9 ng mL À1 , respectively. The R.S.D. at a concentration level of 20 ng mL À1 of iron, copper and cadmium were 2.5%, 0.9% and 1.5% (n ¼ 6), respectively. The procedure was applied to the simultaneous determination of iron, copper and cadmium in the tap water and some synthetic samples with satisfactory results.

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Determination of iron in seawater using cathodic stripping voltammetry preceded by adsorptive collection with the hanging mercury drop electrode

Cited by 105 publications

References 7 publications

Application of Adsorptive Stripping Voltammetry for Iron Determination with Catechol in Quartz and Silica Glass Samples

Application of Adsorptive Stripping Voltammetry for Iron Determination with Catechol in Quartz and Silica Glass Samples

Iron determination in osteoblast‐like cell culture medium by adsorptive cathodic stripping voltammetry with a mercury microelectrode

Simultaneous Determination of Iron, Copper, and Cadmium by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

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