OPTIMASI METODE ANALISIS INJEKSI ALIR PADA ANALISIS SURFAKTAN ANIONIK

Surfaktan atau surface active agents merupakan bahan aktif  yang terdapat pada detergen, sabun, shampo dan lain-lain. Penggunaan surfaktan dalam jumlah besar berdampak pada tercemarnya lingkungan, seperti pencemaran air. Untuk mengetahui seberapa besar tingkat pencemaran yang terjadi maka perlu dilakukan penentuan kadar surfaktan dalam air yang tercemar. Penentuan kadar surfaktan umumnya dilakukan dengan spektrofotometri sinar tampak yang melibatkan proses ekstraksi. Namun metode ini membutuhkan waktu yang lama dan banyak menggunakan pelarut, sehingga perlu dikembangkan metode yang lebih efektif dan efisien. Pada penelitian ini telah dikembangkan metode analisis surfaktan anionik berbasis analisis injeksi alir (flow injection analysis/ FIA) melalui teknik prakonsentrasi menggunakan minikolom C18 dengan deteksi spektrofotometri sinar tampak. Surfaktan anionik (Sodium Dodecyl Sulfate) akan membentuk pasangan ion dengan zat warna kationik (Brilliant Green) yang terkumpul pada minikolom C18.  Pasangan ion ini kemudian dielusi dengan pelarut organik seperti metanol-kloroform (1:9). Spektrum sinar tampak dari pasangan ion BG-SDS memiliki serapan maksimum pada panjang gelombang 629 nm. Pasangan ion BG-SDS terbentuk dengan optimum pada pH 6. Analisis pendahuluan menunjukkan adanya hubungan yang linear antara perubahan konsentrasi SDS dengan nilai absorbansi pasangan ion. Semakin besar konsentrasi SDS maka nilai serapannya pun semakin besar. Konsentrasi BG optimum yang digunakan untuk membentuk pasangan ion sebesar 0,003 % m/v

SOLID PHASE EXTRACTION PADA PENENTUAN HG (II) MENGGUNAKAN C-18 BERBASIS FLOW INJECTION ANALYSIS (FIA)

Analisis merkuri dalam jumlah renik dapat dilakukan secara spektrofotometri UV-Vis yang didasarkan pada pembentukan kompleks assosiasi antara HgI42- dengan ferroin, Fe(phen)32+. Kompleks assosiasi memiliki serapan maksimum pada λ 512 nm dan feroin memiliki serapan maksimum pada λ 510 nm. Meskipun menyerap pada panjang gelombang yang relatif sama tapi feroin tidak teretensi pada kolom C18 yang bersifat hidrofobik sehingga tidak mengganggu prakonsentrasi merkuri. Pembentukan kompleks berlangsung optimum pada pH 4,5. Kompleks assosiasi teretensi pada kolom C-18 dengan kapasitas retensi 2,58 µg Hg2+/ g C-18 dengan menggunakan eluen metanol 9 mL. Kepekaan dan batas deteksi masing-masing diperoleh 0,136 µg/L dan 18,54 µg/L. Dari kinerja kinerja analitik yang diperoleh dapat disimpulkan bahwa metode ini dapat digunakan untuk analisis Hg(II) pada tingkat konsentrasi renik dalam sampel ai

THE EFFECT OF CONCENTRATION OF CARRIER, pH AND TIME OF EXTRACTION ON SEPARATION'S FACTOR OF PENICILLIN G - PHENYL ACETATE BY REACTIVE EXTRACTION

The aim of this research is to study the effect of concentration carrier, pH and time of extraction on separation's factor of penicillin g - phenyl acetate by reactive extraction technique. The 10 mL  aqueous  solution with variation of  pH : 5, 6 contains 0.001 M penicillin G and 0.001 M phenyl acetate has been extracted with 10 mL n-butyl acetate contains dioctylamine as carrier. Variation concentration  of carrier were 0.000; 0.002; 0.004; 0.006 and 0.008 M. Variation time of extraction were 1, 5, 10, 15 and 20 min. The penicillin G and phenyl acetate that dissolved in organic phase ha been  reextracted with 10 mL aqueous with variation of pH : 7, 8. The optimum condition obtained as follow : concentration dioctylamine was 0.002M ; pH the first phase water was 5 and the second phase water was 8 ; and the time of extraction was 10 min.   Keywords: Separation factor, Reactive extractio

Proceeding of The International Seminar on Chemistry

Abstract In recent years the separation chemistry of the rare-earth elements (REE) continue to receive a growing interest. The major reasons for this stand from the high application interest of the REE in many field. Elements such as Ce, La, Sm, Gd, and Nd and their compounds find various commercial applications. Gd is useful in nuclear technology for fuel element fabrication and as control rods, and as refractory material in ceramic industries.The pyrazolone and their derivates compound has been known that can be used for selective extraction and separations of metal ions such as REE. In this experiment, HPMBP has been synthesized and characterized by melting point, TLC, HPLC, FTIR, and NMR spectral data. The sorption of Ce , and sorption capacity of the impregnated resin were investigated by batch method

Separation of La(III), Ce(III), Pr(III) and Nd(III) using Solvent Impregnated Resin (SIR)

Separation of rare earth elements (REEs) with solvent impregnated resins (SIR) using di(2-ethylhexyl)phosphoric acid (D2EHPA) and Amberlite XAD-16 as a polymeric support by a dry method has been studied. The effect of contact time on the separation of La(III), Ce(III), Pr(III) and Nd(III) ions with (D2EHPA-resin = 10/90, 20/80, 40/60, 50/50, 60/40 wt%) at pH 3,0 has been chiefly investigated. The results demonstrated that La(III)/Ce(III) ions at pH 1,00 and Ce(III)/Pr(III) at pH 3,50 and also Pr(III)/Nd(III) ions at pH 2.50 could be separated with separation factor (&alph

MODIFIED GAS-LIQUID SEPARATOR FOR THE DETERMINATION OF Sn(II) WITH HYDRIDE GENERATION-QUARTZ FURNACE FLAME â?? ATOMIC ABSORPTION SPECTROPHOTOMETRY (HG-QFAAS)

The performance of determination of Sn(II) ion with hydride generation-quartz furnace atomic absorption spectrophotometry (HG-QFAAS) has been studied, by modifying the gas-liquid separator used. This modified gas-liquid separator at various sizes was able to increase sensitivity in the determination of Sn(II) in liquids. It has been determined that separators perform best at tube lengths of 9 cm and tube diameters of 3 cm, in which the mixing techniques reagent of acid, sample and reductant occur in a coil before going to the gas-liquid separators. The analytical performance in this method is good, which is shown by detection limit 3.74 &m

Recovery emas dari limbah amalgamasi dengan metode solvent empregnated resin menggunakan cyanex 921

ix+37hlm.;29c

INTEGRATED GAS-LIQUID SEPARATOR-REACTOR FOR DETERMINATION Sn(II) AT TRACE LEVELS IN SOLUTION

The determination of Sn(II) ion at trace levels using integrated gas-liquid separator-reactor with hydride generation-quartz furnace atomic absorption spectrophotometer (HG-QFAAS) has been done. This modified gas-liquid separator at various sizes was able to increase sensitivity in the determination of Sn(II) in solution. The acid reagent mixing techniques, sample and reductant optimally occurs in a coil reaction before they are going to the gas-liquid separators. The optimum conditions of parameter measurement in the determination of Sn ion with HG method are influenced by type and concentration of acid, and the concentration of reductant has been evaluated. This optimum parameters can increase of analytical performance simultantly, which is shown by detection limit 3.74 mg L-1 for 100 mL injection volume (3.74 pg Sn). The accuracy of measurement shown by the % recovery of the Sn determination in natural water sample at > 95%, indicate this technique is good to be applied for tin analysis at picogram level.   Keywords: Sn, hydride generation, gas-liquid reactor separator, QFAA