[ABSTRAK
Sensitivitas elektroda emas dan elektroda glassy carbon sebagai sensor oksigendapat ditingkatkan melalui modifikasi nanopartikel emas pada permukaanelektroda glassy carbon. Modifikasi ini dapat dilakukan dengan menggunakanteknik self assembly. Deteksi oksigen dengan elektroda termodifikasi ini dapatdigunakan untuk pengukuran nilai BOD. Sensor pengukuran BOD dianalisakansebagai sensor oksigen terlarut dalam air dengan memperhitungkan selisih darikadar oksigen yang terlarut sebelum dikonsumsi oleh mikroorganisme, dansetelah dikonsumsi oleh mikroorganisme. Pengukuran sensor oksigen inidilakukan dengan menggunakan cyclic voltammetry pada kisaran potensial -2000mV hingga 2000 mV dan scanrate 100 mV/s. Puncak reduksi untuk pengukuranoksigen dengan menggunakan elektroda GC-NP Au berada pada potensial sekitar-0,538 V, sedangkan untuk elektroda GC dan Au masing-masing berada padapotensial -0,51 V dan -1,16 V. Hasil pengukuran menunjukkan bahwakemampuan pemisahan sinyal dari background pada elektroda GC-NP Au(S/B=1,8994) lebih baik dibandingkan pada elektroda GC (S/B=1,53) danelektroda Au (S/B=1,19). Elektroda GC-NP Au sensitivitas yang lebih baikdibanding GC dan Au. Presisi pengukuran respon arus sebanyak 10 kali terhadaplarutan buffer posfat yang dialiri oksigen selama dua menit diperoleh sebesar19,44% (RSD) untuk Au, 11,84% untuk GC, dan 10,50% untuk GC-NP Au. Hasilpengujian elektroda GC-NP Au untuk pengukuran BOD menunjukkan perbedaanarus yang sangat signifikan pada saat adanya khamir dan saat tidak adanyakhamir.

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ABSTRACT
Sensitivity of gold electrodes and glassy carbon electrodes as oxygen sensors can

be improved through modification of gold nanoparticles on glassy carbon

electrode surface. This modification can be done using self assembly techniques.

Detection of oxygen with this modified electrode can be used for the measurement

of BOD value. Sensors that is used for the measurement of BOD value is sensor

for measurement of dissolved oxygen in water by calculating the difference in the

levels of dissolved oxygen before being consumed by microorganisms, and when

consumed by microorganisms. Measurement of the oxygen sensor is performed

using cyclic voltammetry at potential range of -2000 mV to 2000 mV and scanrate

100 mV/s. Reduction peak for oxygen measurement using GC-NP Au electrode at

a potential of about -0.538 V, whereas for GC and Au electrodes each are at

potential -0.51 V and -1.16 V. The measurement results show that the separation

ability of the background signal on GC electrode Au-NP (S / B = 1.8994) better

than the GC electrode (S / B = 1.53) and Au electrodes (S / B = 1.19). Sensitivity

of GC-NP Au electrode is better than GC and Au. Precision measurement of the

flow response to the phosphate buffer solution by flowing oxygen for two minutes

was obtained for 19.44% (RSD) for Au, 11,84% for GC, and 10,50% for GC-NP

Au. Test results-NP Au GC electrode for BOD measurement showed a highly

significant difference in flow at the moment the absence of yeast and the present

of yeast., Sensitivity of gold electrodes and glassy carbon electrodes as oxygen sensors canbe improved through modification of gold nanoparticles on glassy carbonelectrode surface. This modification can be done using self assembly techniques.Detection of oxygen with this modified electrode can be used for the measurementof BOD value. Sensors that is used for the measurement of BOD value is sensorfor measurement of dissolved oxygen in water by calculating the difference in thelevels of dissolved oxygen before being consumed by microorganisms, and whenconsumed by microorganisms. Measurement of the oxygen sensor is performedusing cyclic voltammetry at potential range of -2000 mV to 2000 mV and scanrate100 mV/s. Reduction peak for oxygen measurement using GC-NP Au electrode ata potential of about -0.538 V, whereas for GC and Au electrodes each are atpotential -0.51 V and -1.16 V. The measurement results show that the separationability of the background signal on GC electrode Au-NP (S / B = 1.8994) betterthan the GC electrode (S / B = 1.53) and Au electrodes (S / B = 1.19). Sensitivityof GC-NP Au electrode is better than GC and Au. Precision measurement of theflow response to the phosphate buffer solution by flowing oxygen for two minuteswas obtained for 19.44% (RSD) for Au, 11,84% for GC, and 10,50% for GC-NPAu. Test results-NP Au GC electrode for BOD measurement showed a highlysignificant difference in flow at the moment the absence of yeast and the presentof yeast.]