Environmental monitoring

Determination of Ag Content in Unknown Liquid Samples

1 Sample solution preparation
About 0.1g sample (accurate to one ten thousandth) was weighed and placed in a 25ml beaker, 5mL nitric acid was added, then heated on a hot plate for about 1h.  It was cooled, transferred to and made up to the volume of 50ml, then dilute by 10 times, and set aside for later use. Blank test was done simultaneously.

2 Experimental equipment and reagents
AA-7003 Series Atomic Absorption Spectrophotometer (with Ag Hollow Cathode Lamp, EWAI Inc.)
Temperature-controlled hot plate
Nitric acid (HNO3): excellent grade purity
Ag standard solution (National Reference Materials Research Center)

3 Instrument conditions
Parameter Wavelength
(nm)
Slit width(nm) Burner height(mm) Fuel gas flow rate(L/min) Lamp current(mA) Flame type
Ag 328.1 0.2 10 1.5 3 Air - acetylene

4 Standard solution preparation
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5  Standard curve
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Curve equation:0.99980
Linearity coefficient:Y=0.15862*X+0.00259
 

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