中心切割GC-MS法分析煤液化油中的酚类化合物

使用碱洗提酚法提取煤液化油中的酚类化合物,然后结合Deans Switch装置和LTM色谱柱模块,采用中心切割气相色谱(GC)-质谱(MS)法对提取的酚类化合物进行定性。采用GC建立标准曲线,对煤液化油中主要酚类化合物的质量分数进行测定,并测定了煤液化油中邻甲基苯酚、2-乙基苯酚、4-丙基苯酚和5-茚酚4种酚类化合物的加标回收率。结果表明,在煤液化油中共定性出51种酚类化合物,测定了其中的35种酚类化合物的质量分数,其量占煤液化油总量的2.54(wt)%,苯酚和烷基苯酚占35种酚类化合物的88.2(wt)%。煤液化油中4种酚类化合物的加标回收率高,重复性好。     

中心切割GC-MS法分析煤液化油中的酚类化合物

使用碱洗提酚法提取煤液化油中的酚类化合物,然后结合Deans Switch装置和LTM色谱柱模块,采用中心切割气相色谱(GC)-质谱(MS)法对提取的酚类化合物进行定性。采用GC建立标准曲线,对煤液化油中主要酚类化合物的质量分数进行测定,并测定了煤液化油中邻甲基苯酚、2-乙基苯酚、4-丙基苯酚和5-茚酚4种酚类化合物的加标回收率。结果表明,在煤液化油中共定性出51种酚类化合物,测定了其中的35种酚类化合物的质量分数,其量占煤液化油总量的2.54(wt)%,苯酚和烷基苯酚占35种酚类化合物的88.2(wt)%。煤液化油中4种酚类化合物的加标回收率高,重复性好。     

顶空固相微萃取-气相色谱法测定饮用水中5种氯酚

氯酚类化合物(CPs)广泛存在于环境中,其中2,4-二氯酚、2,4,6-三氯酚和五氯酚等都具有较高的毒性,可以通过食物链转移、富集和放大,具有弱雌激素作用和改变酶功能作用,影响生殖发育,被美国环保局列入优先控制污染物名单[1]。目前氯酚类化合物的测定主要采用衍生化气相色谱法[2]、吹扫捕集-气相色谱-质谱法[3]、固相萃取-液相色谱-串联质谱法[4]、固相萃取-气相色谱-串联质谱法[5]以及     

快速高效液相色谱法测定卷烟主流烟气中的酚

简单酚类化合物是卷烟主流烟气中的一类重要有害成分,采用液相色谱分离检测酚类化合物已有许多文献报道。为了进一步缩短分离时间,我们采用快速高效液相色谱法（HPLC）测定了卷烟主流烟气中的酚,主要酚在2．0min内可达到基线分离,取得令人满意的结果。     

络合萃取对氯苯酚平衡的研究

氯代酚类化合物具有致癌、致突变的潜在毒性,是重要的工艺原料,广泛应用于化工、杀虫剂、杀菌剂、防腐剂和造纸工业.且常作为工业生产废弃物释放到自然环境中,是危害极大的污染物.由于氯酚结构稳定,用常规工艺和生物处理难以降解,尤其在单氯酚中,对氯苯酚更难降解.     

低温煤焦油中酚含量的高效液相色谱快速测定

本提出了用反相高效液相色谱法测定低温裂解煤焦油中酚类化合物的新方法。用碱性溶剂从焦油馏分中提取的酚类化合物可直接进样进行反相高效液相色谱分析。操作条件是：色谱柱：Ｚｏｒｂａｘ ＯＤＳ，φ４．６ｍｍ×２５０ｍｍ；流动相：甲醇／水，用本法测定了低温焦油中五个馏分中苯酚，甲苯酚，二甲酚，三甲酚，萘酚等共八个组分的含量。碱性溶剂提取酚的回收率大于９８％。     

电化学分析法测定水中酚和铬(Ⅵ)的研究

本文对库仑分析和流动注射-直接伏安分析法测定水中的酚和铬(Ⅵ)进行了研究。 提出用重铬酸钾氧化酚,恒电流产生二公铁,库仑滴定剩余的重铬酸钾来间接测定酚类化合物。对影响滴定效率和氧化效率的因素进行了探讨,选择最佳的实验条件,对实际水样作了分析,同时验证了重铬酸钾对酚的氧化产物主要是苯醌。方法具有准确度高,仪器简便等特点,可用于标定酚溶液或测定环境样品中的酚。     

水中酚类化合物的固相萃取-气质联用法测定

酚类是指苯环或稠环上带有羟基的化合物,酚类对人体具有致癌、致畸、致突变的潜在毒性.饮用水经氯气消毒时会产生卤代酚,不但会使饮用水带有氯酚味,影响口感,还会带来健康风险.所以国内外对水中酚的检测非常重视,美国环保局(EPA)优先监控的酚类化合物共11项,我国水中优先控制污染物黑名单中酚类化合物有6项[1].     

电化学催化氧化降解含酚废水的研究进展

酚类化合物具有高毒性,难降解性,国内外研究者越来越重视含酚废水的治理.电化学催化氧化技术在降解酚类化合物方面的研究较多.作者深入探讨了电化学催化氧化技术降解酚类化合物的机理和历程,概述了一些常用阳极材料的优缺点,最后指出了该技术存在的一些问题与发展前景.     

流动注射分析法测定地面水中酚

目前广泛应用测定酚的方法是Emerson改进的4-氨基安替比林比色法,此法主要缺点是不能测定对位酚。本文采用流动注射电流分析技术研究了微量酚类化合物的测定,并进行实际水样分析。本方法可测定ppb—ppm的酚,灵敏度与文献相当,但操作简单,样品用量少,体现了流动注射分析的快速特点,每小时可测80个样品。实验部分仪器:流动注射分析仪由蠕动泵、旋转进样阀、混合管、检测器、放大器、记录仪几部     

Regioselectivity of olefin oxidation by iodosobenzene catalyzed by metalloporphyrins : control by the catalyst

The regioselectivity of the oxidation of three monosubstituted olefins, 6-phenoxyhex-1-ene, hex-1-ene and styrene, by iodosobenzene in the presence of various Fe-, Mn- or Cr-tetraaryl-porphyrins, was studied. It was found that, besides epoxides, known products from such systems, allylic alcohols and aldehydes were formed, the latter not being derived from the corresponding epoxides. The relative importance of these reactions greatly depends upon both the metal and porphyrin constituents of the catalyst. More particularly, the competition between epoxidation and allylic hydroxylation can be efficiently controlled by non-bonded interactions between the olefin and porphyrin substituents. No hydroxylation of the aromatic rings and no oxidative dealkylation of the ether function was detected.     

Substitution of 2-phosphaindolizines by bromine and by chlorophosphines

Bromine does not add to phosphorus in a 2-phosphaindolizine 1 but substitutes its 1-position. The 1-bromo derivatives 2 are best prepared with Br₂/NEt₃ or N-bromosuccinimide. Their hydrolysis is remarkable; it involves a debromination of C-1, an oxidation of P and a selective opening of the P/C-3 bond. PCl₃ also causes a substitution of the 1-position. The resulting 1-dichlorophosphino derivatives 5 easily undergo a substituent exchange at the exocyclic phosphorus. More 1-phosphino derivatives are formed in the reaction of 1 with phenyl and diazaphospholyl dichlorophosphine.     

Synthesis of arylaliphatic chlorosilanes by alkylation of aromatic compounds by alkenylchlorosilanes

Conclusions In combination with HCl or H₂O, EtAlCl₂ is an active catalyst for alkylation of aromatic compounds by alkenylchlorosilanes, and compounds of boron, titanium, and tin are inactive in this reaction.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1639–1641, July, 1985.     

Optimal acidity of complexes by solution of polynomials and by iteration

The methods for optimal acidity of complexes M(x)L(y)(OH)(m)H(n) based on direct iteration or solution of polynomials are described and discussed. Then, by a direct straightforward method of computation (that does not require any iteration) the complexes M(x)L(OH)(m)H(n) and ML(y)(OH)(m)H(n) are treated (where 1 x 3 and 1 y 3). Finally, the conditions leading to formation of polynuclear complexes are shown and discussed. The importance of study of polynuclear complexes for solving of biochemical problems is pointed out. Practical examples are given for each method.     

Monoalkylation of acetonitrile by primary alcohols catalyzed by iridium complexes

The monoalkylation of acetonitrile by primary alcohols was achieved in a one-pot sequence in the presence of iridium catalysts. A diversity of nitriles has been obtained from aryl- and alkyl-methanols in excellent yield.