Determination of 5 Impurities in Activated Carbon by IC50

SKU
IC50d5iac

IC50 was used to determine the contents of silver, chromium, copper, molybdenum, and zinc in activated carbon. The experimental results showed that the detection limit of the method was between 0.9 μg/kg and 5.9 μg/kg, the precision was less than 3.1%, and the recovery rate was 95.4. % ~106.2%. The method has higher sensitivity and lower detection limit, and the method is fast and accurate, and can meet the requirements of analyzing activated carbon impurity elements. 

Technical difficulties 
Organic matrix 
Trace element

activated carbon has advantages such as large surface area, high strength and good adsorption performance. It is widely used as a high-quality adsorbent and catalyst carrier for food hygiene, medicine, environmental protection, and drinking water treatment. Solvent recovery and gas separation, purification and many other areas. The content of impurity elements in activated carbon directly affects the catalytic performance of the catalyst. Therefore, during the preparation of the catalyst, the determination of the content of various impurity elements in activated carbon is very important. 
Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-OES) has been widely used in the detection of activated carbon impurity elements because of its advantages of simultaneous determination of multiple elements, wide linear range, high sensitivity, less interference, and high analytical efficiency. According to "GJB 6239.12-2008 military impregnated activated carbon test method", IC50 is used to determine the contents of silver, chromium, copper, molybdenum and zinc in activated carbon. 
Sample preparation
Accurately weigh 0.1g (accurate to 0.0001g) in a beaker, leaching with 1+1 nitric acid micro-boiling, hot filtration, and adding water to 50g. The sample blank was obtained using the same pretreatment method except that no sample was added. 
Instrument configuration
IC50 Inductively coupled plasma emission spectrometer; analysis parameters are shown in Table 1.

parameter

Settings

Instrument model

IC50(R)

RF power (W)

1300

Cooling gas (L/min)

14

Auxiliary gas (L/min)

0.60

Atomization gas (L/min)

1.0

Analysis pump speed (rpm)

50

Washing pump speed (rpm)

100

Observation height (mm)

12

Points method

Smart points

Table 1 IC50 Instrument Conditions
Standard solution preparation
  A standard solution with a concentration of 1000 μg/mL was used to prepare a concentration gradient as shown in Table 2, which was used to establish a standard curve. The linear correlation coefficient was measured to be greater than 0.999.

Solution number

Element name

Standard solution concentration (μg/mL)

1

Ag, Cr, Cu, Mo, Zn

0/0.5/1.0/2.0/5.0/10

Table 2 Standard Solubility of Each Element Preparation Gradient 
The detection limit
  The reagent blank was measured for 11 consecutive times. The 3 times standard deviation was used as the detection limit of the element. The detection limit of each element is shown in Table 3.

element

Detection limit (μg/kg)

Ag328.0

1.2

Cr267.7

2.4

Cu324.7

0.9

Mo202.0

2.9

Zn213.8

5.9

Table 3 Detection limits of the tested elements 
Measurement results and spike recovery
  Five parallel samples were measured by IC50 to examine the precision of each element, and a certain concentration of liquid standard sample was added before the pretreatment to perform a standard recovery experiment to examine the accuracy of the method. The results are shown in Table 4. The relative standard deviations of the five parallel samples were all less than 3.1%, and the recoveries were between 95.4% and 106.2%.

element

Sample measurement (mg/kg)

Added value (mg/kg)

After the standard test (mg/kg)

Recovery rate

(%)

RSD

(n=5,%)

Ag

35.2

50

84.7

98.6

3.1

Cr

101.1

50

155.8

104.7

2.5

Cu

79.5

50

125.9

95.4

1.8

Mo

3.4

5

8.3

98.0

2.7

Zn

143.0

50

201.9

106.2

1.6

in conclusion
  In accordance with the "GJB 6239.12-2008 Military Immersion Activated Carbon Test Method", IC50 was used to determine the contents of silver, chromium, copper, molybdenum, and zinc in activated carbon. The experimental results showed that the detection limit of this method was 0.9 μg/kg ~ 5.9 μg/kg. The precision was less than 3.1%, and the recoveries were between 95.4% and 106.2%. The method has higher sensitivity and lower detection limit, and the method is fast and accurate, and can meet the requirements of analyzing activated carbon impurity elements. 
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