CID Bio-Science: May 2015, Here Comes the Sun

March 25, 2016 at 11:28 pm | Updated March 25, 2016 at 11:28 pm | 2 min read

Our CI-340 Handheld Photosynthesis System directly measures H2O and CO2 fluxes from leaves, and calculates photosynthesis, stomatal conductance, and transpiration rate from the leaf-level data it collects. This instrument is used all over the world in a broad range of research, from measuring photosynthetic capacity of alpine plants to measuring the stress response of agricultural plants in drought conditions.

Here’s what one researcher had to say about the CI-340:

“I would say that it is one of the most convenient and portable instruments for photosynthesis measurement. I used it for the measurement of net photosynthetic rate, stomatal conductance, and transpiration rate and found the readings quite accurate. I would like to suggest it to all researchers engaged in physiological studies of plants.” –Dr. Fahim Nawaz

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To learn more about the features and specifications of the CI-340 Handheld Photosynthesis System, visit the CI-340 Product Page.


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Tips from Tech Support

Question: How can I tell if my soda lime is working and still scrubbing CO2?
Answer: Soda lime does have a PH-sensitive Ethyl Violet color change indicator, but this is weak and typically doesn’t change color strongly even though the soda lime has lost strength. Absorption of CO2 by soda lime requires moisture, so if the soda lime has dried out this will reduce scrubbing capabilities.  

You can test your soda lime by connecting it to the CI-340 intake. Start a measurement in Single Channel Absolute mode (S) so you are simply reading the CO2IN value.  Blow into the tubing going into the soda lime column and watch the CO2IN reading on the CI-340 to see if it increases. There will be a lag time while the sample from your breath travels through the soda lime and tubing to the CO2 IRGA sensor. If the CO2 IN rises up, the soda lime is probably exhausted and needs replacement.  

To refresh soda lime, try adding a small amount of water to the bottom of the soda lime/desiccant column. You should not add more than 5 cc of water at a time. Be sure to replace the cotton filter at either end of the plastic column of soda lime. Repeat the breath test to see if the soda lime improves at scrubbing CO2. If not, replace the soda lime with fresh and test again.  


Recent Publications


CI-340 Handheld Photosynthesis System 

Munirah, N., Khairir, M., Nozulaidi, M., Jahan, M. 2015. The Effects of Zinc Application on Physiology and Production of Corn Plants. Australian Journal of Basic and Applied Sciences, 9(2): 362-367.

Larrue, S., Daehler, C., Vautier, F., Bufford, J. 2014. Forest Invasion by the African Tulip Tree (Spathodea campanulata) in the Hawaiian Islands: Are Seedlings Shade-Tolerant?


Visit Us: Upcoming Events & Conferences


Expo Cientifica, CTR 2015 
*With special presentation, “Applications in Plant Physiology: From the Atmosphere to the Rhizosphere,” by CID Application Scientist, Andrea Melnychenko

Start Date: May 27
End Date: May 28
Location: Mexico City, Mexico

Land Quality and Landscape Processes

Start Date: June 03
End Date: June 03
Location: University of Pannonia, Georgikon Faculty, Hungary
Distributor Attending: MEGRA


Plant Biology (Serbia)

Start Date: June 17
End Date: June 20
Location: Petnica Science Center, Petnica, Serbia
Distributor Attending: MEGRA

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