<p><span lang="EN-US">Research of chromium (VI) separation has been done using </span><span lang="EN-US">p</span><span lang="EN-US">olymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) method. This study aims to generate PIM, separate the metal ion chromium (VI) using PIM and determine the effect of the concentration of the feed phase, the thickness of the membrane and the amount of usage of the membrane for ion chromium (VI) diffusion.</span><span lang="EN-US">Polymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) was made by mixing Aliquat 336-TBP as carrier compounds, PVC as the base polymer, DBE as a plasticizer and THF as a solvent. PIM membrane was placed between the source of analyte as a feed phase and result of the separation as a receiver phase. Feed phase was electroplating waste metal containing chromium (VI) at pH 4, while the receiver phase was a 2 N NaCl solution with a pH 6.7. </span>The change of v<span lang="EN-US">ariable</span>s<span lang="EN-US"> in this study </span>were<span lang="EN-US"> the concentration of the feed phase </span>at various dilution i.e.,<span lang="EN-US"> 100x, 50x and 10x, the thickness of the membrane i.e., 25 μm, 20 μm and 10 μm</span>,<span lang="EN-US"> and the </span>time of <span lang="EN-US">membrane</span> using i.e.,<span lang="EN-US"> 1, 2 and 3 times. The concentration of chromium (VI) diffused after separation process </span>was<span lang="EN-US"> analyzed </span>by <span lang="EN-US">a</span><span lang="EN-US">tomic </span><span lang="EN-US">a</span><span lang="EN-US">bsorption </span><span lang="EN-US">s</span><span lang="EN-US">pectroscopy (AAS). </span>T<span lang="EN-US">he stability of membrane was observed </span>by analyzing the presence of<span lang="EN-US"> membrane</span>’s<span lang="EN-US"> component </span>in the<span lang="EN-US"> feed</span> phase<span lang="EN-US"> and </span>in the <span lang="EN-US">receiver phase</span>. The analysis was conducted by UV-Vis <span lang="EN-US">spectrophotometry</span>. Meanwhile, s<span lang="EN-US">canning </span><span lang="EN-US">e</span><span lang="EN-US">lectron </span><span lang="EN-US">m</span><span lang="EN-US">icroscopy (SEM) </span>analysis was used <span lang="EN-US">to determine the morphology of membrane surface.</span><span lang="EN-US">The results showed that the chromium ion concentration </span>diffused<span lang="EN-US"> from the feed phase was 99.24</span><span lang="EN-US">%</span>, mean<span lang="EN-US">while the 85.88</span><span lang="EN-US">%</span> of it diffused to the receiving phase<span lang="EN-US">. The highest Cr(VI)</span> ions<span lang="EN-US"> diffus</span>ion was occured at<span lang="EN-US"> the first use of PIM membrane with a thickness of 10 μm and the concentration of the feed phase</span> was<span lang="EN-US"> 10.55 ppm</span> (resulted from 100 times dilution)<span lang="EN-US">. </span>Therefore, i<span lang="EN-US">t can be concluded that the diffusion of chromium (VI) ion was influenced by the concentration of feed phase, the thickness of membrane and </span>the number of membrane application<span lang="EN-US">.</span></p>

ABSTRAKTelah dilakukan penelitian pemisahan logam krom(VI) menggunakan metode polymer inclusion membrane (PIM). Penelitian ini bertujuan untuk menghasilkan PIM, melakukan pemisahan ion logam krom(VI) menggunakan PIM dan menentukan pengaruh konsentrasi fasa umpan, ketebalan membran dan banyaknya pemakaian membran terhadap difusi ion logam krom(VI). PIM dibuat dengan mencampurkan Aliquat 336-tributyl phosphate (TBP) sebagai senyawa pembawa, polyvinyl chloride (PVC) sebagai polimer dasar, dibutyl ether (DBE) sebagai plasticizer dan tetrahydrofuran (THF) sebagai pelarut. Membran PIM diletakkan diantara fasa umpan sebagai sumber analit dan fasa penerima sebagai hasil pemisahan. Fasa umpan adalah limbah elektroplating yang mengandung logam krom(VI) dengan pH 4, sedangkan fasa penerima adalah larutan NaCl 2 N dengan pH 6,7. Variabel berubah yang digunakan dalam penelitian ini adalah konsentrasi fasa umpan dengan variasi pengenceran: 100x, 50x dan 10x, ketebalan membran: 25 μm, 20 μm dan 10 μm dan pemakaian membran sebanyak 3 kali. Kadar ion logam krom(VI) yang berdifusi sesudah proses pemisahan dianalisis menggunakan atomic absorption spectroscopy (AAS). Uji stabilitas membran dilakukan dengan cara analisis keberadaan senyawa komponen penyusun membran di dalam fasa umpan dan fasa penerima. Analisis dilakukan dengan menggunakan spektrofotometri UV-Vis. Sedangkan analisis scanning electron microscopy (SEM) dilakukan untuk mengetahui morfologi permukaan membran. Hasil penelitian menunjukkan bahwa ion logam krom(VI) yang paling banyak berdifusi dari fasa umpan sebesar 99,24 % sedangkan yang berdifusi ke fasa penerima sebesar 85,88 %. Difusi ion logam tertinggi terjadi pada pemakaian pertama membran PIM dengan ketebalan 10 μm dan konsentrasi fasa umpan 10,55 ppm (hasil dari 100 kali pengenceran). Sehingga dapat disimpulkan bahwa difusi ion logam krom(VI) dipengaruhi oleh konsentrasi fasa umpan, ketebalan membran dan jumlah pemakaian membran.Kata Kunci: limbah elektroplating, membran cair, pemisahan ion krom (VI), polymer inclusion membrane.