UV-photooxidation as pretreatment step in inorganic analysis of environmental samples

Golimowski, Jerzy; Golimowska, Katarzyna

doi:10.1016/0003-2670(96)00034-7

Cited by 192 publications

(141 citation statements)

References 87 publications

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…UV photo-oxidation can be used for organic phosphorus compounds in marine and freshwaters [47,76,77] but condensed polyphosphates present in the sample will not be broken down by UV photooxidation alone [2,3,78,79] and also need to be heated to 90-120 • C in the presence of acid [75]. To ensure that all polyphosphates present in the sample are decomposed, either boiling with HCl or potassium peroxydisulfate after UV irradiation is therefore recommended [80]. McKelvie et al used an on-line UV photo-oxidation flow injection (FI) technique and found that results were comparable with a batch peroxydisulfate method [81].…”

Section: Digestion Techniquesmentioning

confidence: 99%

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Worsfold

Gimbert

Mankasingh

et al. 2005

Talanta

162

View full text Add to dashboard Cite

Section: Digestion Techniquesmentioning

confidence: 99%

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Worsfold

Gimbert

Mankasingh

et al. 2005

Talanta

162

View full text Add to dashboard Cite

“…16,27,28 In order to increase the · OH concentration in solutions, the repetitive addition of H 2 O 2 during the irradiation process is normally employed. Furthermore, the photo-decomposition of aqueous samples by action of · OH radicals is accelerated when carried out at about 90 °C, since a higher concentration of · OH is formed in this medium.…”

Section: Optimization Of the Uv Photo-decomposition Of Epo Samplesmentioning

confidence: 99%

“…Furthermore, the photo-decomposition of aqueous samples by action of · OH radicals is accelerated when carried out at about 90 °C, since a higher concentration of · OH is formed in this medium. 16,19,20,27 Since the complete decomposition of the EPO sample was shown to be necessary (Figure 1), the parameter irradiation time and H 2 O 2 concentration were firstly optimized for 1:10 diluted EPO samples acidified with 20 µL of concentrated H 2 SO 4 . Firstly, it could be observed that the irradiation of spiked EPO samples from 0.5 to 6 h without any addition of H 2 O 2 was not sufficient for the decomposition of samples prior to AdCSV determinations.…”

Section: Optimization Of the Uv Photo-decomposition Of Epo Samplesmentioning

confidence: 99%

“…16 In order to investigate the influence of this parameter, we submitted the spiked EPO samples to the UV irradiation process in a home-made UV digestor, which contained a high-pressure mercuy lamp of 400 W routinely used for public illumination. 15 As it can be seen in Table 3, lower recovey values (85-96%) were obtained for Al, Cr and Ni in spiked EPO samples irradiated under the optimized conditions (Table 2) by using a 400 W radiation source.…”

Section: Optimization Of the Uv Photo-decomposition Of Epo Samplesmentioning

confidence: 99%

“…Since the method normally uses small amounts of reagents (few mL of acids and H 2 O 2 ) for the photodecomposition, it eliminates the matrix interference without contaminating the sample before the analysis. 16 This paper describes the determination of some nephrotoxic metals, such as Al, Cr and Ni, in commercial formulations of EPO by using AdSV methods and UV photo-decomposition of the samples. The methods are based on the AdSV determination of Al in the presence of solochrome violet RS (SVRS), Cr in the presence of diethylenetriaminepentaacetic acid (DTPA) and nickel in the presence of dimethylglyoxime (DMG) as organic ligands.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of metallic contaminants in human recombinant erythropoietin (EPO) formulations by adsorptive cathodic stripping voltammetry and UV photo-decomposition of samples

Carvalho¹,

Garmatz²,

Spengler³

et al. 2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A contaminação de pacientes com insuficiência renal por espécies metálicas pode estar associada a presença destes na medicação empregada durante o tratamento. Dentre os possíveis contaminantes estão metais nefrotóxicos tais como alumínio, cromo e níquel. No presente trabalho, a presença de Al, Cr e Ni como contaminantes em formulações de eritropoetina (EPO) foi investigada através da otimização de métodos analíticos empregando a voltamétria adsortiva de redissolucao catódica (AdCSV) associada a foto-decomposição de amostras com radiação UV. A irradiação UV de amostras acidificadas de EPO pelo período de 2 a 3 horas na presença de H 2 O 2 possibilitou a decomposição eficiente da amostra e a determinação dos contaminantes por AdCSV sem a interferência da matriz. O método otimizado foi aplicado na determinação dos metais em formulações comerciais de EPO utilizadas rotineiramente no tratamento da anemia em pacientes com insuficiência renal crônica. Os níveis de contaminação encontrados nas amostras estudadas variaram de 420,2 a 840,5 ng mL -1 (RSD 2-5%) para o Al, de 12,0 a 40,0 ng mL -1 (RSD 2-6%) para o Cr e de 4,1 a 8,2 ng mL -1 (RSD 3-8%) para o Ni. Os resultados obtidos por AdCSV foram comparáveis aos obtidos por espectrometria de absorção atômica com atomização em forno de grafite (GFAAS). A contaminação de formulações EPO com Al, Cr e Ni mostrou ser uma fonte de contaminação importante para pacientes anêmicos com insuficiencia renal crônica.The contamination of renal failure patients by metals can be associated to the presence of toxic metals in the medication, since they can be absorbed by the organism. Among the possible contaminants, there are nephrotoxic metals such as aluminum, chromium and nickel. In the present work, the presence of Al, Cr and Ni as contaminants in erythropoietin formulations (EPO) was investigated by optimizing the adsorptive cathodic stripping voltammetric (AdCSV) method and the photo-decomposition of samples by UV irradiation. The UV irradiation of acidified EPO samples from 2 to 3 h in the presence of H 2 O 2 allowed the efficient sample decomposition and the determination of the contaminants by AdCSV without matrix interferences. The method was applied for the determination of the metals in commercial EPO formulations used routinely in the treatment of anemia in patients undergoing chronic renal failure. The contamination levels determined in the samples ranged from 420.2 to 840.5 ng mL -1 (RSD 2-5%) for Al, 12.0 to 40.0 ng mL -1 (RSD 2-6%) for Cr and 4.1 to 8.2 ng mL -1 (RSD 3-8%). The results obtained by AdCSV were in good agreement with those obtained by the comparative GFAAS measurements. The contamination of EPO formulations with Al, Cr and Ni was shown to be a serious contamination source for anemic patients undergoing chronic renal failure.Keywords: adsorptive cathodic stripping voltammetry, UV irradiation, photo-decomposition, erythropoietin IntroductionChronical renal failure causes a wide variety of metabolic disturbances which affect almost every organ in the body syst...

show abstract

Sono-Electroanalysis: Application to the Detection of Lead in Petrol

2000

View full text Add to dashboard Cite

The quantitative detection of lead in petrol is shown to be possible by anodic stripping voltammetry in aqueous media under conditions of insonation‐induced emulsification. An immersion horn probe is introduced into a thermostatted conventional three‐electrode cell opposite a mercury plated platinum disk working electrode. Under ultrasonic emulsification of the sample, lead is preconcentrated as an amalgam on the Hg/Pt electrode surface via reduction at –1.0 V (vs. SCE). The large mass transport associated with power ultrasound makes this step highly efficient. Subsequently the lead is quantified by applying an anodic linear sweep of the potential from –1.0 V to –0.15 V (vs. SCE) so as to oxidize the Pb(0) to Pb(II). The area under the stripping peak gives a measure of the lead formed during the initial step. By use of standard microaddition of lead to the solution the system can be calibrated to give the total amount of lead present in the petrol sample. Experiments using samples of 4 star leaded petrol gave a total lead content of 380±40 mgL–1. This value was in quantitative agreement with that obtained by an independent laboratory using atomic absorption spectroscopy (AAS). In addition to the high mass transport and emulsification insonation offers the crucial benefits of first surface activation and cleaning, helping to prevent electrode fouling by the organic components of petrol and second the complete extraction of lead from the water‐insoluble target phase.

show abstract

UV-photooxidation as pretreatment step in inorganic analysis of environmental samples

Cited by 192 publications

References 87 publications

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Determination of metallic contaminants in human recombinant erythropoietin (EPO) formulations by adsorptive cathodic stripping voltammetry and UV photo-decomposition of samples

Sono-Electroanalysis: Application to the Detection of Lead in Petrol

Contact Info

Product

Resources

About