CHN Testing
Midwest Microlab is capable of testing solid or liquid samples for total percentage of Carbon, Hydrogen and Nitrogen with a range of 0.01% (100 ppm) to 100%. Accuracy for CHN testing is within +/- 0.15. Environmentally sensitive samples are handled in a 99.99% Oxygen free glove box. Midwest Microlab is a micro-elemental analysis lab with a minimum transferable sample size of 3 mg to perform single CHN Testing.
CHN Testing
Carbon Testing
Hydrogen Testing
Nitrogen Testing
Finding Total Percentage of CHN
Air Sensitive / Glove Box Handling Sample Analysis
For an accurate evaluation of purity, air-sensitive samples require weighing under an inert atmosphere. Midwest Microlab maintains a reduced oxygen and moisture free handling system. Very highly hygroscopic samples many times will also benefit from this type of special handling. The glove box is operated with 99.9% EXTRA dry nitrogen. Purging is done under vacuum before any samples are handled. An oxygen monitor continually checks the internal environment for the presence of oxygen. The system also contains electrostatic reduction equipment to aid in handling. Samples weighed under an inert atmosphere MUST be transferrable. These samples must be either liquids or solids. Please click on the following link for Air Sensitive / Glove Box fees: Midwest Microlab Price List
Oxygen PPM Level
NOTE: this monitor rarely shows a zero count. Though we continually strive for the best results, no inert chamber can be absolutely free of oxygen and/or moisture. Samples are therefore weighed as quickly as possible under these conditions. Every effort is made to secure the best possible measurement of elements requested. Experience has shown that samples that are able to withstand 15 sec exposures at 40 ppm oxygen work very well.
Elemental Analysis Available for Air Sensitive:
Air sensitive handling at Midwest Microlab is limited to the following elements ONLY: Carbon, Hydrogen, Nitrogen, and Oxygen. Please note the Air Sensitive Handling on your Submission Form.
We do NOT handle air-sensitive samples containing any of the following: Osmium, non-depleted Uranium, or Thallium.
Shipping for Air Sensitive Samples:
Small glass ampoules or compression sealed vials are the best ways to send air sensitive samples. This helps to eliminate any degradation in transit. Please do not have wax sealed ampoules or vials as this could damage the air sensitive gloves. Samples that are only slightly oxygen sensitive, can give good results when sealed tightly in screw cap vials. For these a second sealed outer vial should be included. As with all analysis, samples MUST be highly purified to achieve.
Note from our Senior Chemist:
One of the biggest problems in the analysis of air-sensitive samples is the amount(size) of the individual samples submitted. Accuracy greatly declines when transferring less than 3 mg of material.
Please recognize that powdery substances will almost always tend to adhere to glass vials and are not totally recoverable. The extremely dry atmosphere can also cause static to decrease the total transfer. A slight excess of sample is always preferable.
We always try to obtain the most accurate results with what is sent. This is rarely achieved when sealing less than the necessary amount of material. Many pure substances yield poor results when combusting low sample weights.
Please keep these ideas in mind when sealing up all samples for air-sensitive work. This is expensive and time consuming work. We strive to do our best in achieving accurate and precise measurements when processing your samples.
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Midwest Microlab
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info@midwestlab.com
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7212 North Shadeland Ave
Suite #110
Indianapolis, IN 46250
Office Number: (317) 849-6606
Fax Number: (317) 849-8534
Monday - Friday
9am - 5pm