Soil Oxygen Sensor

Soil Oxygen Sensor MIJ-03

Soil Oxygen Sensor MIJ-03

MIJ-03 developed by our company Environmental Measurement Japan in April 2006. MIJ-03 soil oxygen sensor is used for the measurement of the root aspiration. MIJ-03 detects the density of oxygen in the soil by % order without any difficulties, it simply digs up the hole in the soil and lay this sensor into the ground. An usual usage of this sensor is laid in a vertical direction at intervals of 20 to 50 cm. Researchers can measure the vertical profile of the O2 in the soil.

Why we recommend our MIJ-03?

Soil Oxygen Sensor MIJ-03 is built from a rigid thermoplastic, that allows long-term stability in most environmental conditions; thus it’s life time is maximum about 10 years.

Most users are not willing to maintenance the sensors; MIJ-03  is friendly to those users because it need only minimum maintenance. Once the sensor is installed in the soil, you do not need to care about maintenance.

MIJ-03 can be connected to EMJ data logger MIJ-12 or MIJ-01. If you have your own data logger you may be able to connect MIJ-03; this is because it has a voltage output that can be supported by any compatible data logging system. 

Features

Can be used for long term observation with easy set-up

・Automatic temperature compensation

・No influence by the rain or other waters

・Easy span calibration

Not require to do the zero calibration. 0% Oxygen = 0 mV output

Difference between dissolved oxygen sensor and soil oxygen sensor MIJ-03

Soil oxygen sensor MIJ-03

Since soil is rarely flooded, an soil oxygen sensor MIJ-03 developed to solve the problem that the dissolved oxygen sensor cannot measure for long term measurement because dissolved oxygen sensor need water to measure oxygen. Since MIJ-03 structure does not care for direct contact between the electrodes and the soil so no maintenance need and permanent installation is possible. The normal measurement range is 0 to 20.9%. Soil oxygen can never be higher than 20.9% of atmospheric oxygen. As a special case, rice field have a period of both  flooding and drainage so both dissolved oxygen sensor and soil oxygen sensor MIJ-03 are often use together for this particular field.

Dissolved oxygen Sensor

Sensor that measures oxygen dissolved in water. The normal measurement range excluding supersaturation is 20mg/L measured in ppb units.
In the case of permanent installation, be careful of electrode contamination.

Figures

Figure 1.
Measured oxygen and pF at same time.
Although there are fluctuations due to irrigation, it is interesting that it is not rapid.

Figure 2.
Data at north area of Hokkaido (Measurements of O2、CO2、PAR)

Setting image & Schematic

Setting Image

Schematic diagram of MIJ-03

Specifications

Theory Galvanic Battery + Porous membrane sheet
Shape   40mm, Length 78 mm
(Cable support joint  is 50mm height extra.)
Output   45 – 65mV at 20.9%O2
(Users must check the output at the air before set-up)
Weight 220g(Including cable)
Cable Length 5m (+/White, -/Black,  Shield cable)
Temperature Effect At R.H. 100 % and O2 20.9%.
Sensor out put is 20.8% at 5, 19.4% at 40degree.  
                                 
At R.H. 0% and O2 20.9%.
It is not influence from the temperature effect
Temperature range 0~40℃  (-10~60℃ with Temperature compensation)

Temperature compensation

As Specification sated that temperature range 0~40℃ but you can use -10~60℃ with temperature compensation.
Meaning of temperature range  0~40℃ is without using temperature but gives you precise oxygen value(%).

User may want to use at low or high soil  temperature then please use below temperature compensation formula.

Compensated Oxygen value (%) = Measured Oxygen (%) *(1.00479-0.001914*Temp)

Example:
If use use MIJ-03 at soil temperature 60℃ and the oxygen value was 20%.

20*(1.00479-0.001914*60)=20*0.88995=17.799(%)

References

模擬古墳を用いた埋蔵環境下における遺物の保存に関する研究
東南アジア地域における環境低負荷型の地域発展を目指した資源開発由来の水質汚染対策 PreventionofWaterPollutionCausedbyResourcesDevelopmentsinSouth-eastAsiancountries,AimedatCommunityDevelopmentwithLowEnvironmentalImpacts
湛水栽培と点滴潅がい栽培の相違による水稲のヒ素含有量の比較
Dry Cover Method to Prevent Acid Mine Drainage Generation in Coal Mine Site: Oxygen and Water Behavior Field Measurement
大豆作圃場での土中水分・酸素濃度の降雨応答 (Observed response of soil moisture and O2 concentration to rainfall events in a soybean field)
土中に敷設された廃棄物最終処分場キャッピング用複合シートのガス透過性実証実験 (Gas Permeability of Hybrid Geosynthetics for Landfill Cap Cover Installed in the Underground)
ガス透過性防水シートの適応に関する検討
自然的原因による重金属汚染の対策技術の開発
除染廃棄物仮置場カバーシート 供用中のガス透過性に関する現地比較実験
低地下水位下のキャベツ栽培転換畑における土壌水分・土壌酸素濃度の動態 Movement of soil moisture and soil oxygen concentration in rotational upland field cultivating cabbage under low ground water level
Short and long term release mechanisms of arsenic, seleniumand boron from a tunnel-excavated sedimentary rock under insitu conditions
Relationship Between Short-Term Compression Strength and Transmissivity Properties of Geonets
Comparative field experiment on gas permeability of cover sheets for temporary storage sites of decontamination waste
Effects of Additional Layer(s) on the Mobility of Arsenic from Hydrothermally Altered Rock in Laboratory Column Experiments
Appendix O NOEF Closure Monitoring System Report
Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields
Capabilities and limitations if DGGE for the analysis of hydrocarbonoclastic prokartyotic communities directly in environmental samples
低圃場負荷地下かんがい・排水システムの開発
ガス透過性防水シートの開発と除染廃棄物仮置場への適用 Development of Gas-permeable/Waterproof Sheet and Its Application to temporary Storage Site for Decontaminated Waste
満砂した砂防・治山堰堤の水質変換機能に関する水文地形学的評価
Study on the Effects of Covering and Adsorption Layers on Immobilizing Arsenic from Hydrothermally Altered Rock