{"id":3993,"date":"2025-10-10T16:45:18","date_gmt":"2025-10-10T08:45:18","guid":{"rendered":"https:\/\/www.pgeneral.com\/?p=3993"},"modified":"2025-10-10T16:45:18","modified_gmt":"2025-10-10T08:45:18","slug":"determination-of-chromium-in-refined-sulfur-graphite-furnace-atomic-absorption-spectrometry-2","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/id\/applications\/determination-of-chromium-in-refined-sulfur-graphite-furnace-atomic-absorption-spectrometry-2","title":{"rendered":"Penentuan kromium dalam sulfur halus (spektrometri penyerapan atom tungku grafit)"},"content":{"rendered":"

1. Gambaran Umum Metode<\/h2>\n
Setelah sampel dicerna, absorbansinya diukur pada panjang gelombang 357,9 nm melalui atomisasi tungku grafit. Dalam kisaran konsentrasi tertentu, penyerapan kromium proporsional dengan kandungan. Penentuan kuantitatif dilakukan dengan membandingkan dengan seri standar.<\/div>\n
\n

2. Instrumen dan Reagen<\/h2>\n<\/div>\n
\n

2.1 Instrumen dan Peralatan<\/h3>\n

2.1.1 Instrumen Pengujian<\/h4>\n
\n
\n\n\n\n\n\n\n\n
Serial No.<\/th>\nNama<\/th>\nKuantitas<\/th>\nPersyaratan Teknis<\/th>\nAksesoris<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nSpektrofotometer Penyerapan Atom Tungku Grafit<\/td>\n1 set<\/td>\n–<\/td>\nLampu Katoda Hollow Kromium<\/td>\n<\/tr>\n
2<\/td>\nSistem Air Bersirkulasi<\/td>\n1 set<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nArgon Gas<\/td>\n1 silinder<\/td>\nKemurnian \u2265 99,99%<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.1.2 Sampel Peralatan Praperawatan<\/h4>\n
\n
\n\n\n\n\n\n\n\n
Serial No.<\/th>\nNama<\/th>\nKuantitas<\/th>\nPersyaratan Teknis<\/th>\nAksesoris<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nPorselen Crucible<\/td>\nBeberapa<\/td>\nVolume: 100 ml<\/td>\n–<\/td>\n<\/tr>\n
2<\/td>\nTungku Listrik<\/td>\n1 set<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nMikropipet<\/td>\n1 masing-masing<\/td>\nKisaran: 100 \u03bcL ~ 1000 \u03bcL, 1000 \u03bcL ~ 5000 \u03bcL<\/td>\nTips: 1 ml, 5 ml<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.2 Reagen<\/h3>\n

2.2.1 Reagen mentah<\/h4>\n
\n
\n\n\n\n\n\n
Serial No.<\/th>\nNama<\/th>\nPersyaratan Teknis<\/th>\nPerkataan<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nAsam Nitrat<\/td>\nKelas MOS<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.2 Reagen yang disiapkan<\/h4>\n
\n
\n\n\n\n\n\n
Serial No.<\/th>\nNama<\/th>\nMetode Persiapan<\/th>\nPerkataan<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nSolusi Asam Nitrat (1 99)<\/td>\nUkur 1 ml asam nitrat, tambahkan ke 99 ml air, dan campur dengan baik.<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.3 Standar referensi<\/h3>\n

2.3.1 Solusi stok<\/h4>\n
\n
\n\n\n\n\n\n
Serial No.<\/th>\nTidak, tidak.<\/th>\nNama<\/th>\nPersyaratan Teknis<\/th>\nPerkataan<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nGSB 04-1740-2004<\/td>\nSampel Standar Cairan Nasional – Kromium<\/td>\nKonsentrasi: 1000 \u03bcg \/ ml<\/td>\nDisediakan oleh Pusat Analisis dan Pengujian Nasional untuk Logam Nonferrous dan Bahan Elektronik<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

3. Prosedur Operasional<\/h2>\n

3.1 Persiapan Sampel<\/h3>\n

3.1.1 Persiapan Solusi Uji<\/h4>\n
Timbangkan 5 g sampel (akurat hingga 0,1 g) dan tempatkan di dalam tenggelam porselen 100 mL. Panaskan crucible di tungku listrik sampai sampel terbakar. Pindahkan crucible ke hood asap dan tunggu sampai belerang benar-benar terbakar habis. Kemudian, panaskan di tungku listrik selama 5 menit lagi. Hapus crucible dan biarkan dingin. Tambahkan 5 mL asam nitrat dan 15 mL air, lalu panas sampai sisanya benar-benar larut. Setelah pendinginan, transfer larutan ke tabung kolorimetrik 25 mL, cairkan ke volume yang ditandai dengan air, dan campur dengan baik.<\/div>\n

3.1.2 Persiapan Solusi Standar<\/h4>\n
    \n
  1. \n
    Persiapan Solusi Perantara Standar Kromium<\/p>\n
    <\/div>\n

    Pipet 100 \u03bcL larutan standar kromium nasional secara akurat ke dalam botol volumetrik 100 mL. Dilucirkan ke volume yang ditandai dengan larutan asam nitrat (99) untuk mendapatkan larutan perantara standar kromium dengan konsentrasi 1 \u03bcg \/ mL.<\/p><\/div>\n<\/li>\n

  2. \n
    Persiapan Seri Standar Chromium<\/p>\n
    <\/div>\n

    Pipet 0,0, 0,25, 0,5, 1,0, dan 2,0 mL dari larutan perantara standar kromium (1 \u03bcg \/ mL) masing-masing ke dalam botol volumetrik 100 mL yang terpisah. Tambahkan (99) larutan asam nitrat ke volume yang ditandai untuk mendapatkan seri standar kromium dengan konsentrasi 0,0, 2,5, 5,0, 10,0, dan 20,0 ng \/ mL.<\/p><\/div>\n<\/li>\n<\/ol>\n

    3.2 Pengujian Sampel<\/h3>\n

    (1) Kondisi Pengujian<\/h4>\n
    Ketentuan Referensi untuk Spektrofotometer Penyerapan Atom Tungku Grafit<\/strong><\/div>\n
    <\/div>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nSpesifikasi<\/th>\n<\/tr>\n<\/thead>\n
    Elemen<\/td>\nKromium (Cr)<\/td>\n<\/tr>\n
    Panjang gelombang (nm)<\/td>\n357.9<\/td>\n<\/tr>\n
    Lebar Band Spektral (nm)<\/td>\n0.4<\/td>\n<\/tr>\n
    Alat lampu saat ini (mA)<\/td>\n2.0<\/td>\n<\/tr>\n
    Koefisien Filter<\/td>\n0.1<\/td>\n<\/tr>\n
    Waktu Integrasi (s)<\/td>\n2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    <\/div>\n
    Program Pemanasan Tungku Grafit<\/strong><\/div>\n
    <\/div>\n
    \n
    \n\n\n\n\n\n
    Elemen<\/th>\nSuhu pengeringan (\u2103)<\/th>\nWaktu Pengeringan (s)<\/th>\nSuhu abu (\u2103)<\/th>\nWaktu Ashing (s)<\/th>\nSuhu atomisasi (\u2103)<\/th>\nWaktu Atomisi (s)<\/th>\nSuhu pembersihan (\u2103)<\/th>\nWaktu Pembersihan (s)<\/th>\n<\/tr>\n<\/thead>\n
    Cr<\/td>\n110<\/td>\n20<\/td>\n600<\/td>\n20<\/td>\n2300<\/td>\n3<\/td>\n2400<\/td>\n2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    (2) Pengujian Sampel<\/h4>\n
    Buka silinder argon dan atur pengukur tekanan argon menjadi 0,5 MPa. Atur instrumen ke keadaan kerja optimalnya, dan ukur penyerapan kosong reagen, seri standar, dan larutan sampel pada panjang gelombang 357,9 nm.<\/div>\n
    <\/div>\n
    Kurangkan penyerapan larutan standar nol dari penyerapan setiap larutan standar. Plot kurva kerja dengan konsentrasi massa kromium (\u03bcg \/ L) sebagai absisa dan absorbansi yang sesuai sebagai ordinat. Berdasarkan penyerapan yang diukur dari larutan uji dan larutan uji kosong, temukan massa kromium dari kurva kerja.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

    1. Method Overview After the sample is digested, its absorbance is measured at a wavelength of 357.9 nm via graphite furnace atomization. Within a certain concentration range, the absorbance of chromium is proportional to its content. Quantitative determination is conducted by comparing with a standard series. 2. Instruments and Reagents 2.1 Instruments and Equipment 2.1.1 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[81,36],"tags":[],"class_list":["post-3993","post","type-post","status-publish","format-standard","hentry","category-petrochemical-and-chemical","category-applications"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/posts\/3993","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/comments?post=3993"}],"version-history":[{"count":0,"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/posts\/3993\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/media?parent=3993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/categories?post=3993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pgeneral.com\/id\/wp-json\/wp\/v2\/tags?post=3993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}