perhitungan jadi
4
Ulangan Berat smpel (mg) Pengencera n Absorbansi Kadar CuSo 4 (mg/tablet ) 1 500 50× 0,302 1,30 2 500 50× 0,342 1,10 3 500 50× 0,325 1,20 4 500 50× 0,375 0,90 5 500 50× 0,356 1,00 6 500 50× 0,320 1,20 ∑ = 0,336667 SD = 0,02641 RSD = × 100 % = × 100% = 7,84455% KV = = 0,0784455 AKURASI (perhitungan % recovery) Ulangan ke Berat Sampel Pengencer an Serapan × sebenarn ya Recove ry 1a 500 mg 50× 0,363 0,843 337,2% 1b 500 mg + Cu standa r 1 50× 0,359 0,865 220,37 %
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perhitungan
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Ulangan Berat smpel (mg)
Pengenceran Absorbansi Kadar CuSo4 (mg/tablet)
1 500 50× 0,302 1,302 500 50× 0,342 1,103 500 50× 0,325 1,204 500 50× 0,375 0,905 500 50× 0,356 1,006 500 50× 0,320 1,20
∑ = 0,336667
SD = 0,02641
RSD = × 100 %
= × 100%
= 7,84455%
KV =
= 0,0784455
AKURASI (perhitungan % recovery)Ulangan ke
Berat Sampel
Pengenceran Serapan × sebenarnya
Recovery
1a 500 mg 50× 0,363 0,843 337,2%1b 500 mg +
Cu standar 1 ppm 1 ml
50× 0,359 0,865 220,37%
2a 500 mg 50× 0,354 0,891 356,4%2b 500 mg +
Cu standar 1 ppm 1 ml
50× 0,349 0,918 240%
3a 500 mg 50× 0,344 0,945 378%3b 500 mg +
Cu standar 1 ppm 1 ml
50× 0,341 0,961 255,926%
Perhitungan × sebenarnyaY = -0,187× + 0,5207
a) 0,363 = -0,187× + 0,52070,187× = 0,5207 – 0,363
× =
= 0,843b) 0,359 = -0,187× + 0,5207
0,187× = 0,5207 – 0,359
× =
= 0,865c) 0,354 = – 0,187× + 0,5207
0,187× = 0,5207 – 0,354
× =
× = -,891d) 0,349 = -0,187× + 0,5207
0,187× = 0,5207 – 0,349
× =
× = 0,918e) 0,344 = -0,187 + 0,5207
0,187× = 0,5207 – 0,344
× =
× = 0,945f) 0,341 = -0,187× + 0,5204
0,187× = 0,5207 – 0,349
× =
× = 0,961
Perhitungan % recovery
a. % recovery = × 100%
= × 100%
= 337,2%
b. % recovery = × 100%
= 220,37%
c. % recovery =
= 356,4%
d. % recovery = × 100 %
= 240%
e. % recovery =
= 378%
f. % recovery = × 100%
=255,526%
