Rancang bangun titrator otomatis untuk alat uji kalium iodat dalam garam konsumsi beriodium

Abstract

Sejarah artikel: Penelitian ini membuat alat uji kalium iodat dalam garam konsumsi beriodium dengan menggunakan titrator otomastis yang dirancang dengan mengacu pada metode titrasi sesuai SNI 3556-2010. Alat uji ini dilengkapi dengan sensor warna RGB TCS230 dan step counter untuk mendeteksi volume titran yang digunakan. Sensor warna RGB TCS 230 tersebut akan membaca perubahan warna endpoint proses titrasi dan memberikan perintah untuk menghentikan titrasi. Informasi volume yang diteteskan stepcounter disampaikan ke software yang telah dibangun di mikrokontroler ATMEGA328 PDIP untuk dihitung kadar kalium iodat dalam sampel garam. Titrator otomatis kalium iodat yang dirancang dapat bekerja dengan baik memberikan hasil uji verifikasi metode yang memenuhi syarat keberterimaan akurasi, presisi dan reproducibility. % Recovery hasil uji akurasi mencapai 99,52 %, uji presisi didapatkan nilai RSDcontoh< CVrepeatability, yaitu 4,23 < 6,31, Uji reproducibility didapatkan nilai % RSD < 0,5 CVhorwitz, yaitu 2,058 < 6,202. Kata kunci: garam beriodium; kalium iodat; titrator otomatis; sensor warna ABSTRACT iodized salt; potassium iodate; automatic titrator; color sensor The purpose of this study was to develop an instrumentation for the determination of potassium iodate in iodized salt using an automatic titration which refers to the titration method according to SNI 3556-2010. This instrumentation was equipped with a TCS230 RGB color sensor and a step counter to detect the volume of the titrant used. The TCS 230 RGB color sensor was reading the end point color changes of the titration process and gave commands to stop the titration. The information on the volume that was dropped by the stepcounter was conveyed to the software that has been built in the ATMEGA328 PDIP microcontroller to calculate the potassium iodate levels in the salt sample. The designed potassium iodate automatic titrator was working well which was indicating acceptable verification data for accuracy and precision including repeatability and reproducibility. % recovery of the accuracy test results reached 99.52%, the precision test obtained the value of RSDexample < CVrepeatability, that is 4.23 < 6.31, the reproducibility test obtained the value of % RSD < 0.5 CVhorwitz, that is 2.058 <6.202.