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Application Note -The Digestion of Waste Water
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Application Note -The Digestion of Waste Water

1784 views - 18-07-2019, 3:03 pm

 

Introduction:

This study evaluated the effectiveness of the NovaWAVE microwave digestion system for the digestion of waste water samples.

 

Sample Type:
Waste water- Municipal waste water in house.QC sample.
• Sample volume: 5 ml
• 4 Replicates


Supplies and Reagents:

1) NovaWAVE SA Model*
2) Quartz 75 ml Vessels*
3) Teflon® Caps and Safety Pressure Release Caps at 30 bar(435psi)*
4) PlasmaPURE HNO3 (70%), 1 ml*
5) PlasmaPURE HCl, 1:1 (1 ml)*
5) Analytical Balance 4 Decimal Places, Mettler-Toledo
6) ICP-MS Perkin-Elmer ELAN 6100
7) Mini-X-Flow Nebulizer*
8) 1.2mm Alumina Injector Torch*
9) Baffled Cyclonic Spray Chamber*
10) 10 ml Graduated Cylinder, Corning

*  Manufactured by SCP SCIENCE


 

Sample Preparation Procedure:

The waste water sample was measured in a graduated cylinder and transferred into a 75 ml quartz vessel. After adding 25 ml of DI water, 1 ml of HNO3 and 1 ml of 1:1 HCl:H2O, the sample was digested in the NovaWAVE following the instrument’s heating profile noted below. After cooling, samples were normalized to 50 ml with DI water.

 

NOVAWAVE Heating Program:  

Stage

Ramp Time (Minutes)

Pressure

(PSI – Limit)

Temperature

(oC) 

Hold Time

(Minutes)
1 10 435 175 10


Recoveries:

  

Element Mass 
(amu)

NovaWAVE

(ppm)

Std. Dev.

(ppm)

Known Values

(ppm)

Recovery

(%)
Li 7 0.026 0.004 0.029 90
Na 23 181 1 181 99
Mg 24 21.8 1.1 22.6 96
Al 27 1131 9 1183 96
P 31 0.124 0.007 0.115 108
K 39 1.4 0.3 1.34 104
Ca 43 3.9 0.2 3.9 100
Ti 48 3.21 0.03 3.12 103
Cr 52 8675 80 8769 99
Mn 55 6.5 0.2 6.8 96
Fe 57 7.15 1.3 6.79 105
Cu 63 50.6 0.5 56.1 90
Zn 68 20 0.7 21.9 91
Sr 88 0.08 0.009 0.075 107
Sb 121 49.8 2.3 55.2 90
Ba 138 0.035 0.008 0.033 106
La 139 0.56 0.03 0.51 110
Tl 205 4.4 0.1 4.3 102
Bi 209 16.8 1.8 16.8 100

 

Conclusion:
For determination of trace metals in waste water, the Ministry of Environment of Quebec sets the acceptable range of recoveries at 15%. All recoveries are within this range. Therefore, the NOVAWAVE system is suitable for waste water digestion.


References:
Certificate of Analysis SC9261560 from SCP SCIENCE
Certificate of Analysis NIST CRM 1059c
USCPSC-CH-E1001-08 method


By:
René-Viet Nguyen, Ph.D, P. Chem.
Application Chemist

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