Parts “A”*

Parts “B”*

Response (peak area × 10⁶)

% formaldehyde in biocide**

Theoretical value

50

0

7.35

11.23

-

0

50

4.46

6.92

-

25

25

5.39

8.3

9.08

Parts “C”*

Parts “D”*

Response (peak area × 10⁶)

% formaldehyde in biocide**

Theoretical value

50

0

1.9

3.08

-

0

50

3.77

5.88

-

25

25

2.99

4.72

4.48