電子捕獲型検出器(ECD)に よるPCBの 定量分析 は ECDがPCBの 異 性体 に対 して異な る感度 で 応答 す る ので,サ ンプル中のPCBを 塩 素化 し,す べ てを10-塩 化 ビフェニルに変 換 して得 るECD信 号 と,既 知 量 の PCB標 準物質を塩素化 して得 るECD信 号 とを比較 し てな され てい る.こ の定量法 は総PCB量 を迅速,か つ 高感度に測定 できるが,前 処理 が面倒であ り,ま たサ ン プル に代 謝ま たは分解が起 っていて も,組 成を無視 して いるので,わ か らない.そ こで各 ピー クの量的な組 成の わか ってい るPCB標 準物 質を使 った定量 分析 はこの欠 点を克服 する. 図-1にAroclor1242(モ ンサ ン ト社)のECDに よ る ク ロマ トグ ラ ムを,表1に そ の組 成 を示...

We describe a micromethod for determining as little as 0.1 microgram of morphine per liter of human urine. The procedure is about 20-fold more sensitive than are currently used gas-liquid chromatographic methods. It is particularly suitable for use as a confirmatory method for large-scale radioimmunoassay screening tests. The procedure involves extraction of morphine from urine and analysis of ...

A dual-purpose study was carried out in an attempt to develop a rapid, sensitive method to identify Neisseria species by gas chromatography and to learn more about the metabolism of these organisms. Sixty-nine isolates of Neisseria were grown in a chemically defined fluid medium; the spent medium was extracted sequentially at pH 2 with diethyl ether and at pH 10 with chloroform. The pH 10 extra...

We describe an analytical method for determining carbamazepine in serum by electron-capture gas chromatography. A single-step extraction is followed by formation of the N-pentafluorobenzamide derivative with pentafluorobenzoyl chloride. For quantitation either of two internal standards may be used: 10-methoxy carbamazepine or 7-chloro-5,11-dihydrodibenz[b,e] [1,4]-oxazepine-5-carboxamide (Squib...

The zinc-cadmium oxide (ZnO-CdO) nanocomposites with different weight percentages of cadmium oxide (CdO) nanoparticles were successfully synthesized by the sonochemical method using zinc and cadmium nitrates as precursors to probe their nano-structured surfaces for the decomposition reactions of chloroethyl phenyl sulfide (CEPS) as a surrogate of sulfur mustard agent simulant. Scanning electron...

1. Survey 1.1. Characteristics to be analyzed 1.2. Concentration Units 1.3. Presentation of Analytical Results 1.4. Quality of Analyses 1.5. Analytical Procedures 2. Flue Gas Sampling 2.1. Sampling Effluents 2.2. Organic Micropollutants Sampling 2.3. Gas Sampling Train 2.4. Sampling of Inorganic Compounds 3. Gas Analyzers 3.1. Survey 3.2. Gas Chromatographic Separation 3.3. Gas Chromatographic ...

Abstract Trace residues of organochlorine pesticides (OCPs) in estuarine surface sediments were investigated at three protected wetlands southern Taiwan using high‐resolution gas chromatography/high‐resolution mass spectrometry (HRGC/HRMS) and chromatography‐electron capture detector (GC‐ECD). This study facilitates the development new strategies for investigating OCPs, particularly background ...

BACKGROUND Pentachloronitrobenzene (PCNB) and hexachlorobenzene (HCB) are highly toxic and widespread in every environmental compartment. Some of metabolic products such as amino/nitro containing chlorinated aromatic compounds can be determined by gas chromatography coupled with electron capture detector (GC-ECD). However, it is difficult to identify some of chlorophenolic and chloroquinolic in...