PENGEMBANGAN SENSOR KADMIUM BERBASIS REAGEN 4-(2-PYRIDYLAZO) RESORCINOL (PAR) PADA CHIP KERTAS UNTUK DETEKSI KONTAMINASI KADMIUM PADA BAWANG PUTIH (ALLIUM SATIVUM)

Abstract

Cadmium sensor based on 4-(2-Pyridylazo) resorcinol (PAR) has been developed for detecting of cadmium in garlic. The purpose of development of cadmium sensor on paper chip was to determine cadmium contamination in garlic. The advantages of cadmium sensor are simple, easy and efficient. This sensor was fabricated by immobilize 15μl 1000 ppm PAR and 15μl phosphate buffer (pH 7) onto Whatman paper. The characterization results of this sensor were: the responsive time at 9 minutes; the linearity in the concentration range 1-8 ppm, with correlation coefficient (r) =0,999. This paper chip sensor has sensitivity of 1,840 ΔMeanRGB/ppm; while LOD was 0,619 ppm and LOQ was 2,603 ppm, respectively. The interference by Hg and Pb is > 5% at 1:100 ratio. This sensor have good precision (3,509%) and accuracy which was 102,341%. Determination of cadmium in garlic was compared with Atomic Absorption Spectrophotometer (AAS) although, the result of analysis cadmium using cadmium sensor and AAS are not detected. However, in simulation samples result, the sensor exhibited good result in precision and accuracy, therefore the developed cadmium sensor can be used as alternative method for detecting cadmium in garlic samples