PERHITUNGAN KADAR ABU KELOMPOK 8

bahan : tempe

1. Berat setelah pengabuan

Rumus : berat krus+berat bahan setelah pengabuan – berat krus

Ulangan 10 = 13,525 – 13,2433

= 0,2817

Ulangan 11 = 13,5589 – 13,1232

= 0,4357

Ulangan 12 = 23,0695 – 23,0297

= 0,0398

2. Kadar abu dalam basis basah (bb)

Kadar abu (g/100 g bahan basah) = [(W 1−W 2)]

W x 100

Ulangan 10 = 0,28171,6121

x 100

= 17,47410

Ulangan 11 = 0,43571,6708

x 100

= 26,07733

Ulangan 12 = 0,03981,685

x 100

= 2,40048

Rata-rata kadar abu basis basah (bb)

= 17,47410+26,07733+2,40048

3

= 15,31730

3. Kadar abu dalam basis kering (bk)

Kadar abu (g/100 g bahan kering) = kadar abu(bb)

[100 ,−kadar air(bb)] x 100

Ulangan 10 = 17,47410[100−65 ]x 100

= 17,47410

35x 100

= 49,92601

Ulangan 11 = 26,07733[100−65 ]x 100

= 26,07733

35 x 100

= 74,50665

Ulangan 12 = 2,40048

[100−65 ] x 100

= 2,40048

35 x 100

= 6,858521

Rata-rata kadar abu basis kering (bk)

= 49,92601+74,50665+6,858521

3

= 43,76373

4. Standar Deviasi basis basah (bb)

SD = √ Σ(x−rata2 x)2n−1

=√ (17,47410−15,31730)2+(26,07733−15,31730)2+(2,40048−15,31730)2

3−1

= 11,98487

5. Standar Deviasi basis kering (bk)

SD = √ (49,92601−43,76373)2+(74,50665−43,76373)2+(6,858521−43,76373)2

3−1

= 34,24248

6. Perhitungan RSD/CV basis basah (bb)

CV = SD

rata2 x x 100

= 11,9848715,31730

= 78,2440

7. Perhitungan RSD/CV basis kering (bk)

CV = 34,2424843,76373

x 100

= 78,2440