Application of Calibration Curve, Accuracy and Precision Chart as Internal Quality Control at COD Testing in Wastewater

Uray Lusiana

Abstract


Quality assurance is one of the technical requirements that include in the quality management system based on SNI ISO/IEC 17025 : 2008. Quality assurance is all the process that planned and systematic activity that applied in analysis, so can give the confidence to the customer or data user. Quality assurance that is applied for COD testing in wastewater are calibration curve, accuracy and precision control chart. The purpose of calibration curve, accuracy and precision control chart applied was to control the data of COD testing so that guaranty the validity to report and to keep the consistence of testing result as statistic all the time. Calibration curve of COD testing have a coefficient correlation 0,99987. Accuracy control chart have limited line BTA = 104,95%, BPA = 102,97%, BIA = 100,98%, BTB = 93,03%, BPB = 95,02% and BIB = 97,0%. Accuracy data can be accepted if that data present between line of BPA and BPB (± 2 SD), data is warned if that data present between line BTA-BPA or BTB-BPB (± 2 SD and ± 3 SD), and data is outlier if that data present out of line BTA and BTB (± 3 SD). The precision data can accepted if that the RPD value is not more than 10 % of COD testing result.

Keywords


accuracy; calibration curve; control chart; precision; quality assurance

Full Text:

PDF

References


SNI ISO/IEC 17025 : 2008. Persyaratan Umum Kompetensi Laboratorium Pengujian dan Laboratorium Kalibrasi

SNI 6989.2-2009, Cara uji Kebutuhan Oksigen Kimiawi (Chemical Oxygen Demand/COD) dengan refluks tertutup secara spektrofotometri.

Anonim, 2011. Pengendalian Mutu Hasil Pengujian dan Kalibrasi.

Anonim, 2009. Pedoman Pengendalian Mutu Internal Pengujian Parameter Kualitas Lingkungan. Kementrian lingkungan Hidup. Jakarta.

Achmad, F., Rahayu, S., dan Sumarriani, Y. 2010. Penerapan Grafik-X dan Grafik-R sebagai Grafik Kendali Dalam Pengujian Kualitas Air. Jurnal Standardisasi. (12)1.

Hardiani, H. 2009. Akurasi Pengendalian Mutu Laboratorium. Balai Pulp dan Kertas. Bandung.

Kantasubrata, J. 2008, Jaminan Mutu Data Hasil Pengujian : Kontrol Sampel dan Aplikasinya. RC Chem Learning Centre. Bandung.

Tahid. 2006. Grafik Pengendali Sarana Untuk Peningkatan Mutu Hasil Uji Laboratorium Pengujian. Warta Kimia Analitik. No. 15 Tahun XII, Pusat Penelitian Kimia-LIPI. Bandung.


Refbacks

  • There are currently no refbacks.


BIOPROPAL Industri

Published by :

Institute for Industrial Research and Standardization (Baristand Industri) in Pontianak

Agency for Industrial Research and Development, Ministry of Industry 

Jl. Budi Utomo No. 41 Pontianak, West Kalimantan, Indonesia

Tel / Fax : +62 561 881393, 881533

email      : biopropal.industri@gmail.com

 

BIOPROPAL Industri indexed in: 

Hasil gambar untuk gambar doajHasil gambar untuk gambar google scholar