欧美……一区二区三区,欧美日韩亚洲另类视频,亚洲国产欧美日韩中字,日本一区二区三区dvd视频在线

產(chǎn)品推薦:氣相|液相|光譜|質(zhì)譜|電化學(xué)|元素分析|水分測(cè)定儀|樣品前處理|試驗(yàn)機(jī)|培養(yǎng)箱


化工儀器網(wǎng)>技術(shù)中心>解決方案>正文

歡迎聯(lián)系我

有什么可以幫您? 在線咨詢

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)

來(lái)源:瑞士萬(wàn)通中國(guó)有限公司   2014年05月07日 14:03  

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 [14]. 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 [29]. 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).

免責(zé)聲明

  • 凡本網(wǎng)注明“來(lái)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(lái)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(lái)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(lái)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(wèn)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。
企業(yè)未開(kāi)通此功能
詳詢客服 : 0571-87858618
国产美女高潮爽到喷水视频| av天堂人妻一区二区三区| 免费观看久久精品日本视频| 国产大片亚洲一区高清在线观看| 国产美女极具色诱视频| 美女扒开爽爽免费视频| 国产亚洲视频在线视频| 亚洲av日韩av一区二区三区| 国产av一级片在线观看| 日韩一区二区三区欧美在线国产| 国产日韩亚洲欧美在线| 国产一码二码三码区别| 亚洲国产成人综合视频| 美女被躁到高潮嗷嗷乱叫| 欧美户外露出在线观看| 国产精品成人av毛片| 亚洲性色精品一区二区网| 欧美一区二区囗爆吞精| 精品国产亚洲日本一区二区| 亚洲无遮挡黄肉av在线播放| 日本啪啪一区二区三区| 欧美熟妇一区二区激情综合| 中文字幕一区二区三区乱码| 亚洲精品一二三伦理中文| 日韩欧美久久免费观看| 成人污网站在线观看免费| 中文字幕一区二区免费| 欧美国产精品视频一区二区| 精品国产亚洲日本一区二区| 国产三级国产精品三级| 91精品国产丝袜熟女| 亚洲欧美丝袜清纯另类| 国产亚洲一区二区三区色噜噜| 人妻少妇一区二三区四区| 国产一区二区不卡三区av| 亚洲精品免费观看av| 免费在线看污视频网站| 亚洲欧美日韩精品麻豆| 一区二区二区中文字幕| 日韩欧美午夜福利视频| 欧美日韩亚在线观看视频|