Microbiological Analysis and Content of Heavy Metals in Different Candies, Chocolates, and Their Wrappers in Bangladesh

Table 2

Calibration data for lead (Pb), chromium (Cr), nickel (Ni), and cadmium (Cd).

Metal	ID	Mean signal (Abs)	Entered conc. (mg/l)	Mean calculated conc. (mg/l)	Std dev	Average recovery (%)
Pb^a	Blank	0.000	0	0.000	—	101.03
	A1	0.0227	1.0	1.095	0.0040
	A3	0.0631	3.0	3.049	0.0002
	A5	0.1024	5.0	4.949	0.0096
Cr^b	Blank	0.000	0	0.000	—	101.88
	B1	0.0235	1.0	1.048	0.0003
	B3	0.0667	3.0	3.077	0.0059
	B5	0.1053	5.0	5.007	0.0017
Ni^c	Blank	0.000	0	0.000	—	102.34
	C1	0.0241	1.0	1.071	0.0087
	C3	0.0620	3.0	3.078	0.0015
	C5	0.1009	5.0	4.982	0.0022
Cd^d	Blank	0.000	0	0.000	—	101.76
	D1	0.0214	1.0	1.037	0.0009
	D3	0.0609	3.0	3.091	0.0041
	D5	0.1077	5.0	5.015	0.0056

^aCorrelation coefficient: 0.9994; slope: 0.0204; intercept: 0.0012. ^bCorrelation coefficient: 0.9986; slope: 0.0210; intercept: 0.0016. ^cCorrelation coefficient: 0.9984; slope: 0.0199; intercept: 0.0019. ^dCorrelation coefficient: 0.9986; slope: 0.0214; intercept: -0.0006.