Pengembangan Teknik Deteksi Ion Logam Fe(III) dengan Menggunakan Nanopartikel Perak yang Distabilkan Kitosan-Formaldehida sebagai Sensor pada Spektrofotometer UV-Vis

Sulistyani Sulistyani, Waode Rustiah, Susila Kristianingrum, Annisa Fillaeli, Fatikhah Nur Hidayati P.S.

Abstract


Penelitian ini bertujuan untuk mengembangkan teknik deteksi ion logam Fe(III) menggunakan nanopartikel perak sebagai sensor pada spektrofotometer UV-Vis. Nanopartikel perak disintesis melalui metode reduksi kimia dengan reduktor natrium sitrat, kemudian ditambahkan agen penstabil kitosan yang diikat silang dengan formaldehid. Selanjutnya, nanopartikel perak yang telah dimodifikasi dengan kitosan-formaldehid direaksikan dengan ion Fe(III) pada berbagai variasi konsentrasi dan sinyal absorpsinya diamati menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa nanopartikel perak-kitosan-formaldehid berhasil disintesis yang ditandai dengan perubahan warna dari bening menjadi kuning kecoklatan dan munculnya serapan maksimum pada λ = 416 nm. Saat berinteraksi dengan ion Fe(III) pada berbagai variasi konsentrasi, serapan maksimum nanopartikel perak yang distabilkan kitosan-formaldehid relatif tidak mengalami pergeseran, tetapi muncul serapan SPR pada λ = 480 nm. Berdasarkan uji kinerja analitik pada daerah SPR, dapat dinyatakan nanopartikel perak yang distabilkan kitosan-formaldehid memiliki kinerja yang baik sebagai sensor ion Fe(III) dengan nilai presisi 0,12%, akurasi 0,075 ppm, nilai linieritas (R2) 0,924 pada rentang konsentrasi dari 1-50 ppm dengan persamaan regresi y = 0,0015x + 0,1646, serta nilai LOD dan LOQ secara berturutan 0,106 ppm dan 0,235 ppm.


Keywords


sensor; nanopartikel perak; kitosan; formaldehid; ion Fe(III)

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DOI: https://doi.org/10.21831/jsd.v11i1.48305

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