5 KESIMPULAN DAN SARAN
5.1 Kesimpulan
Limbah padat cangkang kijing berhasil diisolasi kalsiumnya. Teknologi pembentukan ukuran kalsium yang lebih kecil menjadi nanopartikel berhasil
dibuat dengan metode presipitasi. Rendemen terbaik serbuk nano kalsium diperoleh pada perlakuan waktu ekstraksi 1,5 jam yaitu sebesar 8,53. Perlakuan
ekstraksi 1,5 jam menghasilkan rendemen 5,02, sedangkan perlakuan waktu ekstraksi 2 jam diperoleh rendemen sebesar 7,89. Kandungan kalsium pada
perlakuan waktu ekstraksi 1 jam sebesar 85,57, waktu ekstraksi 1,5 jam adalah 89,89 dan pada perlakuan 2 jam sebesar 86,77. Serbuk nano kalsium juga
mengandung komponen mineral lainnya seperti magnesium, natrium kalium, fosfor, seng, besi, dan mangan. Derajat putih serbuk nano kalsium adalah
69,79. Hasil analisis Pb pada serbuk nano kalsium adalah 0,95 ppm. Hasil pengukuran partikel pada serbuk nano kalsium adalah 120-573 nm.
5.2 Saran
Saran yang dapat diberikan pada penelitian ini adalah perlu dilakukan uji kelarutan mineral untuk mengetahui persentase kelarutan mineral terutama nano
kalsium. Presepitasi dengan perbedaan konsentrasi NaOH perlu dilakukan untuk mengetahui pembentukan endapan nano kalsium yang terbaik dan kemudahan
proses netralisasi.
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LAMPIRAN
Lampiran 1 Perhitungan analisis proksimat
a. Kadar air
Sampel ulangan
A g B g
C g Kadar air
Rata- rata
Cangkang kijing
1 1,0897
27,6818 27,6757
0,56 0,54
2 1,0935
21,5809 21,5753
0,51 Keterangan:
A = bobot sampel awal g B = bobot cawan + sampel sebelum dikeringkan g
C = bobot sampel + cawan setelah dikeringkan g Contoh perhitungan:
= 0,56
b. Kadar abu
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