Research Article

Evaluation of Copper and Manganese Concentrations in Commercial Fruit Juices and Nectars Consumed in Brazil by GF AAS

Table 5

Statistical evaluation (Student’s t-test) of the results obtained in the determination of Cu and Mn by the direct GF AAS method and after acid digestion of samples.

SampleF value (Cu)at value (Cu)bF value (Mn)at value (Mn)a

n-orange1.0770.6822.9663.099
n-mango1.1621.4842.5781.378
n-passion fruit1.0110.0751.0212.411
n-peach1.9983.0321.6770.379
n-grape1.3581.2797.7352.764
j-orange1.072−1.2091.6351.166
j-grape1.1186.8871.1146.612

aF2,2 (two-sided test) = 39.00, at 95% confidence level. btcritical = 4.30 (degrees of freedom = 2), at 95% confidence level. n- and j- indicates the samples of nectar and juice, respectively.