MMR-15

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MMR Technology


MMR Chemistry

Element Microwave evaporation Certified value
Ag 1.53 ± 0.04 1.68 ± 0.15
As 13.8 ± 2.2 14.0 ± 1.2
Cd 4.13 ± 0.24 4.15 ± 0.38
Co 0.49 ± 0.02 0.57 ± 0.11
Cr 1.76 ± 0.03 1.43 ± 0.46
Hg 0.063 ± 0.033 0.0642 ± 0.0067
Mn 11.5 ± 0.5 12.3 ± 1.5
Ni 2.29 ± 1.02 2.25 ± 0.44
Pb 0.38 ± 0.07 0.371 ± 0.014
V 4.59 ± 0.27 4.68 ± 0.15

Concentration of analytes (μg/g) in SRM 1566A (Oyster Tissue) following the microwave-assisted evaporation of the digestate compared with the certified total concentrations (uncertainties are expressed as 95% confidence intervals, with n ≥ 3)

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Ultratrace Inserts

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To keep blank levels as low as possible the analyst must exercise care in keeping the volume of reagents to a minimum
T. Murphy, The role of analytical blank in accurate trace analysis.

Vessel-inside-vessel technology was developed by Milestone in the late 90s. Vessel-inside-vessel technology uses a smaller secondary vessel inside the primary microwave vessel.
The secondary vessel contains the sample and digestion reagents, and the primary vessel contains the solution required to achieve accurate temperature monitoring. This configuration reduces the amount of acid required for digestion to near stoichiometric quantities, which reduces the dilution factor and increases the detection limit.

The use of vessel-inside-vessel technology is also used for the processing of larger organic sample sizes.
This is accomplished by controlling the reaction kinetics and lowering the pressure inside the microwave vessel. Controlling reaction kinetics is especially important when trying to digest large quantities of organic material. The use of vessel-inside-vessel technology helps to control these exothermal reactions by providing a heat sink for the energy liberated during oxidization.

This is accomplished by placing water in the outer microwave vessel. The water draws the heat away from the reaction mixture, slowing down the reaction kinetics and preventing a runaway reaction.
A variety of inserts are available from Milestone, in different materials (Quartz or TFM) and with different sizes and shapes, to accomplish all application requirements.

Advantages

  • Less acid volume
  • Higher sample amount
  • Lower dilution factor
  • Increased method detection limit
  • Less surface contamination
  • Lower analytical blank

No cross contamination

Three blanks were analyzed in run #1. The same blank was prepared along with two Animal Tissue samples, showing no cross contamination.

 

Run #1
Vial Cr (ug/L) Cu (ug/L) Mn (ug/L) Ni (ug/L) Pb (ug/L) Zn (ug/L)
Blank 1 <2 <2 <2 <2 <2 <10
Blank 2 <2 <2 <2 <2 <2 <10
Blank 3 <2 <2 <2 <2 <2 <10

Blank 2 mL HNO3. Analysis by ICP-AES

 

Run #2
Vial Cr (ug/L) Cu (ug/L) Mn (ug/L) Ni (ug/L) Pb (ug/L) Zn (ug/L)
Sample 1 54,8 40,0 14,4 31,6 11,0 148,5
Sample 2 56,1 40,0 14,3 32,6 10,8 148,2
Blank 3 <2 <2 <2 <2 <2 <10

Sample weight 100 mg. Blank 2 mL HNO3. Analysis by ICP-AES



Complete recovery

Element Ultratrace Inserts
(mg/kg) (n=3)
Certified (mg/kg)
As 3,9 4,1 ± 0,5
Cd 19,5 19,6 ± 1,4
Pb 13,4 13,6 ± 0,5
Sb 9,6 10,1 ± 1,6
Zn 135 137 ± 20

Polyethylene EC680K
Sample weight 200 mg. Blank 2 mL HNO3. Analysis by ICP-AES
Element Ultratrace Inserts
(mg/kg) (n=3)
Certified (mg/kg)
Cu 14,8 16,8 ± 1,0
Fe 70,0 79,3 ± 8,3
Mn 8,3 8,8 ± 0,4
Zn 156 163 ± 7

Human Hair IAEA 085
Sample weight 100 mg. Blank 2 mL HNO3. Analysis by ICP-AES