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Abstract

This paper discusses the results of improved optical probe that works according to optical fluorescence and absorption phenomena for measuring the phytoplankton suspension concentrations. Measurements are made on the Scenedesmus sp. culture. The laboratory test has shown that range of concentration from 104 up to around 1 x 106 cells/mL; fluorescence intensity at λ = 685 nm; and logarithmic of transmission intensity at λ = 405 nm are proportional to the cell concentration linear with proportional constant γ = 4 × 10-5 and β = –2 × 10-7 mL/cell respectively.

Bahasa Abstract

Penyempurnaan Probe Optik untuk Mengukur Konsentrasi Suspensi Phytoplankton dengan Memanfaatkan Fluoresensi dan Absorpsi Cahaya. Pada makalah ini dilaporkan hasil rancang bangun penyempurnaan probe optik untuk mengukur konsentrasi suspensi phytoplankton. Dari hasil pengujian skala laboratorium dengan menggunakan kultur Scenedesmus sp. ditunjukkan bahwa untuk rentang konsentrasi dari 104 hingga di sekitar 1 x 106 sel/mL intensitas fluoresensi pada λ = 685 nm memiliki hubungan yang linier terhadap konsentrasi sel dengan konstanta proporsianl γ = 4 × 10-5 mL/sel. Sementara itu untuk rentang konsentrasi yang sama, logaritma intensitas pada λ = 405 nm berbanding lurus dengan konsentrasi sel dengan konstatnta proporsional β = –2 × 10-7 mL/sel.

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