Penentuan Logam Timbal (Pb) dalam gula pasir menggunakan Destruksi Microwave dengan variasi suhu dan waktu secara Spektrofotometri Serapan Atom (SSA)

ABSTRAK

Timbal (Pb) merupakan bahan ikutan dalam gula pasir yang berasal dari proses pembuatannya. Metode analisis logam timbal (Pb) yang sering digunakan adalah spektroskopi serapan atom dengan teknik analisis kurva standar dan adisi standar. Penelitian ini bertujuan mengetahui suhu dan waktu optimum microwave digest, mengetahui performa analitik kurva standar dan kurva adisi standar, serta uji kesesuaian hasil.

Penelitian ini meliputi penentuan suhu dan waktu optimum dengann variasi suhu 160 0C, 180 0C, 200 0C dan waktu 10, 15, dan 30 menit. Performa analitik kurva standar meliputi linearitas, LOD, LOQ, sensitivitas, akurasi, presisi, dilanjutkan dengan penentuan performa analitik kurva adisi standar pada suhu dan waktu optimum, serta dilakukan analisis hasil menggunakan menggunakan uji-t.

Hasil penelitian didapatkan bahwa suhu dan waktu optimum microwave digest adalah 180 0C dan 10 menit dengan konsentrasi 0,05 ppm. Performa analitik kurva standar meliputi r2 = 0,9999, LOD 0,0019 ppm, LOQ 0,0066 ppm, sensitivitas 0,1069, rerata akurasi 99,56 %, presisi 2,32 % dan performa analitik kurva standar adisi standar meliputi r2 = 0,9999, LOD 0,0018 ppm, LOQ 0,0060 ppm, sensitivitas 0,1090, rerata akurasi 100,01 %, dan presisi 1,94 %. Uji-t menunjukkan terdapat kesesuaian secara signifikan antara metode kurva standar dan metode adisi standar.

ABSTRACT

Lead (Pb) is a follow materials in the sugar that comes from the manufacturing process. The methods of analysis lead metal that is often used is atomic absorption spectroscopy with a standard curve analysis techniques and standard addition. This study aims to find the optimum temperature and temperature of microwave digest, to find the analytical performance of the standard curve and standard addition curve, and test compatibility the results.

This research include: determining optimum temperature and time with temperature variation of 160 0C, 180 0C, 200 0C and time variation 10, 15, and 30 minutes. Analytical performance of the standard curve includes linearity, LOD, LOQ, sensitivity, accuracy, precision, continued by determination of the analytical performance using the standard addition curve with optimum temperature and time, and the results analyzed using t-test.

The study obtained that the optimum temperature and time of microwave digest is 180 0C and 10 minutes with concentration of 0,05 ppm. Analytical performance of the standard curve and standard addition includes r2 = 0.9999, LOD 0.0019 ppm, LOQ 0.0066 ppm, the sensitivity of 0.1069, the average accuracy of 99.56%, 2.32% and the precision of the analytical performance of the standard curve addition includes standard r2 = 0.9999, LOD 0.0018 ppm, LOQ 0.0060 ppm, the sensitivity of 0.1090, the mean accuracy of 100.01%, and precision of 1.94%. T-test showed there were significant compatibility between the standard curve method and standard addition method.