高溫水解條件下利用離子色譜同時(shí)測(cè)定煤炭中的鹵素(氟、氯、溴、碘)
Simultaneous determination of halogens (F, Cl, Br, and I) in coal using pyrohydrolysis combined with ion chromatography
高溫水解條件下利用離子色譜同時(shí)測(cè)定煤炭中的鹵素(氟、氯、溴、碘)
Monitoring the halogen levels in coal is important because oftheir effects on human health and the environment. Few methodscan be adopted to determine halogens in coal simultaneously. Fcan only be determined through ion chromatography (IC) and ionselectiveelectrode (ISE), whereas instrumental neutron activationanalysis (INAA) and inductively coupled plasma-mass spectrometry(ICP-MS) can only analyze Cl, Br, and I [1–4]. Sample decomposition is a critical step in halogen analysis. Halogens are volatile and readily lost when the sample is treated; furthermore, the reagents used for sample digestion may interfere with the determination process itself. To eliminate these drawbacks, pyrohydrolysis and microwave-induced combustion (MIC) have been proven effective and reliable digestion methods for determining halogens in coal and oil [2–9]. MIC combined with IC, a routine and classic analytical method for determining halogens in water [10], has been successfully used to determine halogens simultaneously in coal [4]. However, about 15% of Chinese coal has less than 2.5 lg g_1 Br and 75% have less than 3.0 lg g_1 I. Therefore, the limits of detections (LODs) for Br and I (2.5 and 3.0 lg g_1, respectively) obtained using IC coupled with MIC is relatively high [4].
To lower the LODs of Br and I further, the present study establishes a quantitative method for determining F, Cl, Br, and I in coal using the IC system after pyrohydrolysis. The pyrohydrolysis conditions, as well the types and concentrations of the absorption solutions are optimized. The method is validated using certified reference coals (for F) or spikes (for Cl, Br, and I).
相關(guān)產(chǎn)品
免責(zé)聲明
- 凡本網(wǎng)注明“來源:化工儀器網(wǎng)”的所有作品,均為浙江興旺寶明通網(wǎng)絡(luò)有限公司-化工儀器網(wǎng)合法擁有版權(quán)或有權(quán)使用的作品,未經(jīng)本網(wǎng)授權(quán)不得轉(zhuǎn)載、摘編或利用其它方式使用上述作品。已經(jīng)本網(wǎng)授權(quán)使用作品的,應(yīng)在授權(quán)范圍內(nèi)使用,并注明“來源:化工儀器網(wǎng)”。違反上述聲明者,本網(wǎng)將追究其相關(guān)法律責(zé)任。
- 本網(wǎng)轉(zhuǎn)載并注明自其他來源(非化工儀器網(wǎng))的作品,目的在于傳遞更多信息,并不代表本網(wǎng)贊同其觀點(diǎn)和對(duì)其真實(shí)性負(fù)責(zé),不承擔(dān)此類作品侵權(quán)行為的直接責(zé)任及連帶責(zé)任。其他媒體、網(wǎng)站或個(gè)人從本網(wǎng)轉(zhuǎn)載時(shí),必須保留本網(wǎng)注明的作品第一來源,并自負(fù)版權(quán)等法律責(zé)任。
- 如涉及作品內(nèi)容、版權(quán)等問題,請(qǐng)?jiān)谧髌钒l(fā)表之日起一周內(nèi)與本網(wǎng)聯(lián)系,否則視為放棄相關(guān)權(quán)利。