ANALISIS, IDENTIFIKASI PRECURSOR DAN HASIL DEGRADASI SENYAWA SENJATA KIMIA MENGGUNAKAN TEKNIK GAS CHROMATOGRAPHY MASS SPECTROMETRY– ELECTRON IONISASI (GCMS-EI)

Cinnamic Acid Derivate From the Bark of Lerchea bracteata Val

Penyelidikan kandungan kimia dari batang tumbuhan Lerchea brateata Val telah dilakukan dan berhasil mendapatkan senyawa asam 3,4-dihidroksisinamatmetil ester yang diisolasi dari fraksi etil asetat menggunakan metoda kromatografi. Senyawa ini dimurnikan melalui proses rekristalisasi dan berbentuk kristal kekuningan dan meleleh pada 162-163 o C. Struktur dielusidasi melalui interprestasi spektrum...

Gas Chromatography - Mass Spectrometry

Gas Chromatography-Mass Spectrometry

Gas chromatography (GC) is a widely applied technique in many branches of science and technology. For over half a century, GC has played a fundamental role in determining how many components and in what proportion they exist in a mixture. However, the ability to establish the nature and chemical structure of these separated and quantified compounds is ambiguous and reduced, and requires a spect...

Gas Chromatography - Mass Spectrometry

Mercury Speciation Analysis by Gas Chromatography/electron Impact/mass Spectrometry

Fast and reliable analytical methods for mercury speciation would aid in understanding mercury offgas chemistry. Presently, the U.S. Environmental Protection Agency (EPA) regulates only total mercury; however, many studies indicate that mercury toxicity is highly dependent on the mercury speciation. For example, amalgams and mercury sulfides have relatively low toxicities, while organomercury a...