Determination of nitrilotriacetic acid in water by derivative pulse polarography at a hanging mercury drop electrode

Haring, B. J. A.; Delft, W. van

doi:10.1016/s0003-2670(01)83650-3

Cited by 15 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Detection limits of 10 pg/L (5 X M) were obtained without preconcentration, and precision of 1.3% was achieved at 100 pg/L (5 X lo-' M). This basic principle has also been utilized at the HMDE (hanging mercury drop electrode) using DPP (differential pulse polarography) (12). Haberman has reported similar work employing the In(II1) complex (131, and Stolzberg has employed the Cd(I1) complex (14).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Direct determination of chelons at trace levels by one-drop square-wave polarography

Stojek¹,

Osteryoung²

1981

Anal. Chem.

View full text Add to dashboard Cite

The direct anodlc oxldaitlon of mercury In the presence of chelons can be used for determinatlon of the chelons at trace levels. One-drop square-wave polarography proved superior to dlfferential pulse polalrography for thls purpose and gave detection limits of 7, 7, 5, and 20 X IO-* M for EDTA, DCTA, EGTA, and NTA, respecttvely, with callbratlon curves linear to M. At pH 4.8 heirvy metals can be determlned In the presence of Ca2+ by using amperometrlc titratton based on this method.Chelons such as EDTA (ethylenediaminetetraacetic acid) are used in a wide range of industrial, pharmaceutical, and agricultural applicationa. It has been shown that EDTA is resistant to biodegradation ( I ) . It has also been shown that under the conditions normally obtaining in natural waters EDTA exists as negatively charged complexes with protons or metal ions and is not (absorbed on container walls, humic acid, silica, kaolin, river sediments, or humus solids (1). Gardiner infers from the existing data that complexation of trace metals in natural waters by EDTA 1s more important than complexation by humic acids ( I ) . A simple numerical example illustrates this point. With the data of Buffle and Greter (2), the overall conditional formation constants for Pb(I1) with fulvic acid (molecular weight nominally 1000) at pH 6 are given by log PI = 5.1 and log 02 := 9.7 for the complexes PbL and PbLz, where L represents fulvic acid. At the same pH the conditional iformation constant for PbY is given by log K' = 13.4, where represents EDTA. Suppose that Cy, the analytic concentration of Y, is 100 pg/L. K' is sufficiently large that the fraction of lead present as the aquated ion is negligible as long a8 the analytic concentration of lead, Cp,, is less than that of Y. Under these conditions, the fraction of lead complexed with L, is less than 0.1 for concentrations of L less than 7 g/L (7 mF). Similar conclusions are drawn for other cases. Gardiner h a carried out similar calculations which include the effects of competition of Ca(I1) for EDTA and illustrate some limitations of this generalization (1). Undoubtedly EDTA is capable of affecting natural systems to an appreciable extent by mobilizing trace metals.A variety of methods have been employed for the determination of EDTA and related compounds. Gardiner used gas-liquid chromatograplhy of the ethyl derivatives of the sample with DCTA (1,2-cyclohexanediaminetetraacetic acid) added as an internal standard for the determination of EDTA in river water, sewage, arid sewage effluent (3). Detection limits of ca. 5 X M (15 pg/L) with recoveries of ca. 99 f 13% were found with a sample size of 25 mL. Kaiser employed the absorbance of the Co(II1) complex and was able to determine EDTA in mixtures of EDTA and NTA (nitrilotriacetic acid) by selective oxidation of the NTA complex (4). Replicate analyses at the 200 pg/L level of EDTA in mixtures of EDTA and NTA gave precision of 7% (standard Present address: Uniwersiytet Warszawski, Wydzial Chemii, ul. Pasteura 1,02493 Warszawa,, Poland. deviation)....

show abstract

mentioning

confidence: 99%

“…(5 X '7 M). This basic principle has also been utilized at the HMDE (hanging mercury drop electrode) using DPP (differential pulse polarography) (12). Haberman has reported similar work employing the ( ) complex (13), and Stolzberg has employed the Cd(II) complex (14).…”

mentioning

confidence: 99%

Direct determination of chelons at trace levels by one-drop square-wave polarography

Stojek¹,

Osteryoung²

1981

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…Sulfate was measured using an ion chromatography unit (Dionex® 4000i with an HPIC-AS4A column and a mobile phase consisting of 1.7zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA mM NaHC0 3 /1.8 mMNa 2 C0 3 ). EDTA was analyzed by differential pulse polarography (DPP) following the procedure of Haring and Delft (1977) with modifications proposed by Gilbert and Hoffmann-Glewe (1990). Sulfite and thiosulfate were also analyzed by DPP (Noel, 1978).…”

Section: Materials and Methods Zyxwvutsrqponmlkjihgfedcbazyxwvutsrqpomentioning

confidence: 99%

Aerobic biodegradation potential of photoprocessing wastewaters

Pavlostathis¹,

Morrison²

1994

Water Environment Research

View full text Add to dashboard Cite

Currently, over 99% of all photoprocessing laboratories in the U.S. discharge directly to publicly owned treatment works (POTWs) after using various recovery methods. The purpose of this research was to investigate any potential adverse effects of photoprocessing effluents on the activated sludge process. Effluents from two commonly used photoprocesses were tested. These effluents were simulated in the laboratory and fed to fill-and-draw activated sludge reactors at loading levels less than or equal to 20% by volume along with a synthetic base feed. Conventional wastewater treatment parameters along with major photoeffluent constituents, such as ethylene diamine tetraacetate (EDTA), sulfur, and nitrogen species, were monitored. Results indicate that EDTA was recalcitrant and accounted for a significant fraction of the effluent COD. A significant fraction of the reduced sulfur species were oxidized to sulfate resulting in alkalinity consumption and a pH reduction. All activated sludge reactors showed a decrease in influent ammonia concentration and production of nitrate or nitrite. Up to 61% photoeffluent COD removal was achieved by the fill-and-draw activated sludge reactors. Such results demonstrate the potential of aerobic biological processes in the treatment of photoprocessing wastewaters and warrant further study.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Water Environ. Res., 66, 211 (1994).

show abstract

Use of ion exchangers for the voltammetric determination of NTA and EDTA in natural waters

Voulgaropoulos

Tzivanakis

1992

Electroanalysis

View full text Add to dashboard Cite

The indirect trace determination of NTA and EDTA in natural waters is carried out by differential pulse anodc stripping voltammetry (DPASV), after their complexation with bismuth(II1). Chloride ions in relatively high concentrations as well as iron(1II) and copper(I1) interfere with the determination of EDTA and NTA in natural waters. These interferences can be removed by using ion exchangers in the pretreatment of the sample before the voltammetric determination. The interferences of phosphonic acids and humic acids .can also be negated. The determination was performed in sea, lake, river, rain, and waste waters.KEY WORDS : NTA, EDTA, stripping voltammetry, bismuth. INTRODUCTTONThe knowledge of the distribution of heavy metals and their species in natural waters (speciation) is of great importance, with respect to the pollution effects they introduce into the particular ecosystem. In t h i s context, a sensitive and selective method for the determination of EDTA and NTA in natural waters would be of interest, because both compounds form stable complexes with heavy metals and can be found in natural waters [1 -41.In a previous study [51 a new, reliable, sensitive, and selective indirect voltammetric determination of EDTA and NTA, based on their complex formation with bismuth, was described. In that study, however, it was mentioned that chloride ions in relatively high concentrations, iron(II1) and copper(I1) interfere with the determination of EDTA and NTA, and certain procedures to overcome these interferences were suggested. Iron(III), which forms stable complexes with both EDTA and NTA, was reduced to iron(I1) using hydroxylamine hydrochloride. Copper was removed by preelectrolysis, and the chloride interference was avoided by medium exchange. However, preelectrolysis is a quite lengthy procedure. Thus, other ways were searched out. The use of ion exchangers proved to be very promising.Additional experiments were carried out to prove the validity of the assumption that humic and phosphonic acids do not interfere with the determination of EDTA and NTA.

show abstract

Determination of nitrilotriacetic acid in water by derivative pulse polarography at a hanging mercury drop electrode

Cited by 15 publications

References 3 publications

Direct determination of chelons at trace levels by one-drop square-wave polarography

Direct determination of chelons at trace levels by one-drop square-wave polarography

Aerobic biodegradation potential of photoprocessing wastewaters

Use of ion exchangers for the voltammetric determination of NTA and EDTA in natural waters

Contact Info

Product

Resources

About