Enhanced reduction of perchlorate by elemental iron at elevated temperatures

Oh, Seok‐Young; Chiu, Pei C.; Kim, Byung J.; Daniel, K.

doi:10.1016/j.jhazmat.2005.09.006

Cited by 41 publications

(10 citation statements)

References 16 publications

(18 reference statements)

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“…These improved k SA values suggest that stabilizers not only increased the surface area of the nanoparticles (because of the much smaller particle size), but also resulted in a more reactive particle surface. On the other hand, the k SA value for CMCstabilized ZVI nanoparticles is more than two orders of magnitude greater than that for a cast iron (surface area-1.29 m 2 g À1 ) reported by Oh et al (2006a).…”

Section: 3mentioning

confidence: 58%

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Rapid and complete destruction of perchlorate in water and ion-exchange brine using stabilized zero-valent iron nanoparticles

2007

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Because of the unique chemistry of perchlorate, it has been challenging to destroy perchlorate. This study tested the feasibility of using a new class of stabilized zero-valent iron (ZVI) nanoparticles for complete transformation of perchlorate in water or ionexchange brine. Batch kinetic tests showed that at an iron dosage of 1.8 g L À1 and at moderately elevated temperatures (90-95 1C), $90% of perchlorate in both fresh water and a simulated ion-exchange brine (NaCl ¼ 6% (w/w)) was destroyed within 7 h.

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Section: 3mentioning

confidence: 58%

“…Oh et al (2006a) reported that 98% of perchlorate in water was reduced by cast iron (surface area ¼ 1.29 m 2 g…”

mentioning

confidence: 99%

Rapid and complete destruction of perchlorate in water and ion-exchange brine using stabilized zero-valent iron nanoparticles

2007

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“…Chemical treatment processes (e.g., chemical reduction with iron metal) are typically sluggish (Moore et al, 2003). However, recent studies demonstrate high reduction rates of ClO 4 − with iron metal at elevated temperatures (200°C) (Oh et al, 2006) or with nano‐scale iron (Cao et al, 2005). Nevertheless, it is currently impractical to apply these latest developments to in situ or ex situ drinking water treatment systems.…”

mentioning

confidence: 99%

Removal of Perchlorate from Contaminated Waters Using Surfactant‐Modified Zeolite

2007

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We investigated the potential of using surfactant (hexadecyltrimethylammonium)-modified zeolite (SMZ) as an inexpensive sorbent for removing perchlorate (ClO(4)(-)) from contaminated waters in the presence of competing anions. In batch systems, the presence of 10 mM OH(-) (i.e., pH 12), CO(3)(2-), Cl(-), or SO(4)(2-) had little effect on the sorption of ClO(4)(-) by SMZ, indicating that the sorption of ClO(4)(-) by SMZ was very selective. The presence of 10 mM NO(3)(-), however, reduced the sorption of ClO(4)(-) at low initial concentrations. The maximum sorption capacity for ClO(4)(-) by the SMZ remained relatively constant (40-47 mmol kg(-1)), in the absence or presence of the competing ions. In flow-through systems, ClO(4)(-) broke through the SMZ columns much later than other anions present in an artificial ground water. The affinity of the anions for SMZ followed the sequence of ClO(4)(-) > > NO(3)(-) > SO(4)(2-) > Cl(-). Perchlorate loading under dynamic flow-through conditions was 34 mmol kg(-1), somewhat less than the maximum loading of 40 to 47 mmol kg(-1) determined by the batch method. Less than 1% of previously sorbed ClO(4)(-) was leached out by ultra-pure water, by extraction fluid #1 of the standard toxicity characteristic leaching procedure (TCLP), or by a solution of 0.28 M Na(2)CO(3)/0.5 M NaOH. About 40% of the previously sorbed ClO(4)(-) was leached out from SMZ by a 0.5 M NO(3)(-) solution. The exchange of ClO(4)(-) with NO(3)(-) corroborated results of the batch tests where NO(3)(-) was shown to compete with ClO(4)(-) sorption.

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“…하지만 우리나라의 경우 는 6.25 전쟁과 perchlorate 관련 산업이 급속한 발전을 거치면서 perchlorate의 높은 오염 가능성에도 불구하고 매우 제한적으로 perchlorate 오염조사가 실시되었다 (13)(14)(15). 또한, 현재까지 국내의 perchlorate 관련 연구는 전국적인 오염실태와 사람이 섭취하는 주 요 음식물에서의 오염 정도 등에 대한 체계적 연구가 이루어지 지 않은 상태에서 제거 관련 연구만 제한적으로 실시되었다 (16)(17)(18). 최근 국외에서는 다양한 환경시료를 대상으로 최적의 perchlorate 분석을 위한 전처리 방법 및 기기분석연구가 활발히 진행되어 왔 다. Perchlorate 측정방법에는 중량 측정법(gravimetry), 분광측정법 (spectrophotometry), 전기화학법(electrochemistry), 모세관 전기영동 법(capillary electrophoresis) 등 많은 종류의 측정방법이 있으나 사 용의 용이성, 낮은 검출한계, perchlorate의 선택성 등이 우수한 이온 크로마토그래피 방법을 주로 사용하고 있다.…”

Section: CLunclassified

Development of Enhanced Analytical Method for Perchlorate in Food by IC-MS/MS with an Internal Standard

Yang¹,

Kim²,

Han³

et al. 2011

Korean Journal of Food Science and Technology

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The internal standard method using ion chromatography combined with tandem mass spectrometry (IC-MS/MS) for quantifying perchlorate in different types of food was established. Because the presence of ions and other biomolecules in matrices usually interrupts accurate determination of perchlorate, it is necessary to develop efficient, reproducible method to determine perchlorate concentrations in food. In this study, the internal standard method was compared with the external standard method to determine perchlorate concentrations in standard samples. The obtained method detection limit (MDL) for perchlorate was 0.005 µg/L for bottled water, 0.12 µg/L for milk, 0.27 µg/kg for rice, 0.16 µg/kg for vegetables, and 0.07 µg/kg for seaweed, respectively. The limit of quantitation (LOQ) was calculated by multiplying the MDL by 7. The recoveries of perchlorate from food samples spiked with perchlorate ranged from 98 to 105% and their percent relative standard deviation (%RSD) levels were <20%. This method was successfully applied for the quantitative determination of perchlorate in various kinds of food.

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Enhanced reduction of perchlorate by elemental iron at elevated temperatures

Cited by 41 publications

References 16 publications

Rapid and complete destruction of perchlorate in water and ion-exchange brine using stabilized zero-valent iron nanoparticles

Rapid and complete destruction of perchlorate in water and ion-exchange brine using stabilized zero-valent iron nanoparticles

Removal of Perchlorate from Contaminated Waters Using Surfactant‐Modified Zeolite

Development of Enhanced Analytical Method for Perchlorate in Food by IC-MS/MS with an Internal Standard

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