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ANALYTICAL METHOD VALIDATION OF SELECTED ORGANOCHLORINE PESTICIDES IN FORTIFIED RICE USING GAS CHROMATOGRAPHY WITH ELECTRON CAPTURE DETECTOR Wardani, Mutia Kusuma; Sutriyanto, Bambang; Lukitaningsih, Endang; Rohman, Abdul
Journal of Food and Pharmaceutical Sciences Vol 2, No 1 (2014): J. Food Pharm. Sci (January-April)
Publisher : Fakultas Farmasi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.149 KB) | DOI: 10.14499/jfps

Abstract

Gas chromatography with electron capture detector (GC-ECD) has been validated for simultaneous determination of selected organochlorine pesticides namely heptachlor, endosulfan, dieldrin, dan p,p?-dichlorodiphenyltrichloroethane (p,p?-DDT) using aldrin as standard internal. Some parameters for analytical method validation were evaluated, i.e. linearity, precision, sensitivity expressed with limit of detection and limit of quantification, and recovery. GC-ECD was linear for determination of these pesticides with r values ? 0.99. The values of LOD obtained were 2.50, 2.97, 1.61, and 2.54 ng/mL for heptachlor, endosulphan, dieldrin, and p,p?-DDT, respectively. Furthermore, the relative standard deviation (RSD) values obtained for the assessment of analytical precision were lower than those required by Horwitz. Finally, the used GC-ECD method was accurate for determination of these organochlorine psticides in fortified rice samples which were indicated by the acceptable recovery percentages.
Validasi Metode Analisis Multiresidu Pestisida Organoklor dalam Salak Menggunakan Kromatografi Gas-Detektor Penangkap Elektron Raharjo, Tri Joko; Sutriyanto, Bambang; Anugrahwati, Mai; Aprilita, Nurul Hidayat
Agritech Vol 33, No 2 (2013)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1978.335 KB) | DOI: 10.22146/agritech.9809

Abstract

Validation of methods is a key step in the accreditation process of the method. Validation of organoklor pesticide residues method in snakefruit based on the method recommended by FAO-WHO, conducted in LPPT-UGM reported in this study. Snake fruit was homogenized, extracted using toluene/2-propanol (2:1), cleaned up using activated carbon and Celite 545, followed by analysis using gas chromatography-electron capture detector. Validation covered specificity and selectivity, limits of detection and quantification, linear range, precision and accuracy. Validation results showed good specificity and selectivity shown by the inter-peak chromatogram resolution greater than 1.5. Limits of detection and quantification for heptaklor, endosulfan, dieldrin and p, p-DDT were 0.002 and 0.006, 0.5 and 1.7; 0.0006 and 0.002, as well as 0.014 and 0.047 ppm respectively. The linear range for heptaklor, endosulfan, dieldrin, and p,p-DDT were 0.0017 to 2 ppm, 0.165 to 2 ppm, 0.023 to 2 ppm and 0.229 to 2 ppm, respectively. Precision methods meet the acceptance of Horwitz RSD value less than 12.78% at a concentration of 0.3 ppm. Accuracy is indicated by recovery, for each pesticide in the range of 80-110% acceptance at a concentration of 0.1 ppm. Analysis of organochlorine pesticides in three commercial snakefruit samples showed no pesticide residues at concentrations higher than the detection limit.ASBTRAKValidasi metode merupakan tahap kunci dalam proses akreditasi suatu metode. Validasi metode uji residu pestisida organoklor dalam salak berdasarkan metode yang direkomendasikan FAO-WHO, di LPPT-UGM dilaporkan pada penelitian ini. Buah salak dihomogenisasi, diekstraksi menggunakan toluen/2-propanol (2:1), clean up menggunakan karbon aktif dan Celite 545, dilanjutkan analisis menggunakan kromatografi gas-detektor penangkap elektron. Validasi mencakup spesifisitas dan selektivitas, batas deteksi dan kuantifikasi, range linier, presisi serta akurasi. Hasil validasi menunjukkan spesifisitas dan selektivitas yang baik ditunjukkan dengan resolusi antar puncak kromatogram lebih besar dari 1,5. Batas deteksi dan batas kuantifikasi untuk heptaklor, endosulfan, dieldrin dan p,p-DDT secara berturut-turut adalah 0,002 dan 0,006; 0,5 dan 1,7; 0,0006 dan 0,002; serta 0,014 dan 0,047 ppm. Range linier untuk heptaklor adalah 0,0017-2 ppm, endosulfan 0,165-2 ppm, dieldrin 0,023-2 ppm dan p,p-DDT 0,229-2 ppm. Presisi metode memenuhi batas keberterimaan Horwitz dengan nilai RSD lebih kecil dari 12,78% pada konsentrasi 0,3 ppm. Akurasi ditunjukkan dengan recovery, untuk tiap pestisida masuk dalam rentang keberterimaan 80-110% pada konsentrasi 0,1 ppm. Analisis pestisida organoklorin pada 3 sampel salak komersial menunjukkan tidak adanya residu pestisida dengan konsentrasi lebih tinggi dari batas deteksi.
THE EFFECT OF COMPETENCE AND INFORMATION TECHNOLOGY ON TAX-PAYABLE SERVICES IN THE PRATAMA TAX SERVICE OFFICE JAKARTA CENGKARENG Sutriyanto, Bambang
International Journal of Economics, Business and Accounting Research (IJEBAR) Vol 3, No 02 (2019): IJEBAR, VOL. 03 ISSUE 02, JUNY 2019
Publisher : LPPM STIE AAS Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/ijebar.v3i02.531

Abstract

This study aims to measure how significant the influence of employee competencies and also the use of information technology on services provided to taxpayers. In providing services to the community (in this case the tax payment service), employee competence is a determining factor for results that can have a positive or negative effect on the services provided. Supported by increasingly advanced information technology, it is expected that public services, especially to taxpayers at the Pratama Jakarta Cengkareng Tax Service Office, will be faster, easier and better than before. Keywords: Competence, Information Technology, Services