To study the effects of a 50 Hz sinusoidal electric field on the early growth of mung bean seedlings at different electric field strengths.
Several thousands of seedlings were investigated. In every experiment 46 seedlings were exposed and 46 were sham exposed. Each experiment was repeated four to eight times.
Exposure | Parameters |
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Exposure 1:
50 Hz
Exposure duration:
continuous for 6 days
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for further information on the setup see also: Wang CS, Kuo SZ, Kuo-Huang LL, Wu JSB. 2001. Effect of tissue infrastructure on electric conductance of vegetable stems. J Food Sci 66:284-288.
Frequency | 50 Hz |
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Type | |
Waveform | |
Exposure duration | continuous for 6 days |
Exposure source |
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Setup | 23 seeds placed individually in 1 cm x 1 cm x 20 cm single cells of a 0.05 cm thick polycarbonate panel, closed at the bottom with filter paper; two 10 cm x 27 cm x 0.1 cm copper plates placed 28 cm apart on top and bottom of the panel; experimental setup placed inside a Faraday cage that was electrically connected to ground |
Sham exposure | A sham exposure was conducted. |
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
power | 40 µW | minimum | - | - | absorbed power |
power | 120 µW | maximum | - | - | absorbed power |
magnetic flux density | 0.004 nT | - | calculated | - | between the plates |
cf. remarks | - | - | calculated | - | I = 1 µA (max.) measurted between the plates |
electric field strength | 125 V/m | minimum | measured | - | - |
electric field strength | 268 V/m | - | measured | - | - |
electric field strength | 446 V/m | - | measured | - | - |
electric field strength | 536 V/m | - | measured | - | - |
electric field strength | 714 V/m | - | measured | - | - |
electric field strength | 893 V/m | - | measured | - | - |
electric field strength | 1,263 V/m | - | measured | - | - |
electric field strength | 2,525 V/m | maximum | measured | - | - |
The data showed that the extremely low frequency electric field exposure produced an inhibitory effect at a low electric field strength and an enhancing effect at a higher electric field strength. The maximum negative effect (growth inhibition) occured at about 450 V/m, which is much lower than the exposure limit values currently in force in the safety regulations.
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