Abstract
The uptake of 14C-2,4,6-trinitrotoluene (TNT) in hydroponics was studied using onion plants. Of the total TNT mass (5 microM concentration), 75% was in the roots, 4.4% in the leaves, and 21% in the external solution at 2 days. The percent distribution in roots was lower with higher concentration in the external solution, but in leaves it was comparable at all concentrations (5-500 microM). Root concentration factor (RCF) in hydroponics was more than 85 in constant hydroponic experiment (CHE) at 5 microM and 150 in nonconstant hydroponic experiment (NHE) at 5 microM. The maximum RCF values in the hydroponic system were greater with lower solution concentration. Transpiration stream concentration factor (TSCF) values in the present study (NHE only: 0.31-0.56) were relatively similar to the values with predicted values (0.43-0.78), increasing with higher external TNT concentration. All predicted values for RCF and TSCF were derived in the literature from equations using logKow (log10 octanol-water partition coefficient). For phytotoxicity tested in hydroponics and wet paper method, 500 microM was toxic to onion plant, 50 microM was nontoxic for plant growth but limited the transpiration rate, and 5 microM was nontoxic as control.
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Claims 14
Claim · model-written summary
At two days, 75% of TNT mass was in onion roots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the total TNT mass (5 microM concentration), 75% was in the roots, 4.4% in the leaves, and 21% in the external solution at 2 days.”
t0“Onion Plant”
Claim · model-written summary
At two days, 4.4% of TNT mass was in onion leaves.
- Taxon
- Onion Plant
Allium cepat0 - Organ / stage
- leavese0
- Outcome
- TNT masse0
- Value
- 4.4%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the total TNT mass (5 microM concentration), 75% was in the roots, 4.4% in the leaves, and 21% in the external solution at 2 days.”
t0“Onion Plant”
Claim · model-written summary
At two days, 21% of TNT mass remained in external solution.
- Taxon
- Onion PlantAllium cepat0
- Outcome
- TNT masse0
- Value
- 21%e0
- Qualifier
- external solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the total TNT mass (5 microM concentration), 75% was in the roots, 4.4% in the leaves, and 21% in the external solution at 2 days.”
t0“Onion Plant”
Claim · model-written summary
The fraction of TNT in roots decreased as external concentration increased.
- Taxon
- Onion PlantAllium cepat0
- Organ / stage
- rootse0
- Treatment
- higher concentration in the external solutione0
- Outcome
- percent distribution in rootse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percent distribution in roots was lower with higher concentration in the external solution”
t0“Onion Plant”
Claim · model-written summary
The fraction of TNT in leaves was comparable across concentrations.
- Taxon
- Onion PlantAllium cepat0
- Organ / stage
- leavese0
- Treatment
- all concentrations (5-500 microM)e0
- Outcome
- in leaves it was comparablee0
- Direction
- comparablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in leaves it was comparable at all concentrations (5-500 microM)”
t0“Onion Plant”
Claim · model-written summary
Root concentration factor exceeded 85 in constant hydroponics at 5 microM.
- Taxon
- Onion PlantAllium cepat0
- Outcome
- Root concentration factor (RCF)e0
- Value
- more than 85e0
- Setting
- hydroponicse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root concentration factor (RCF) in hydroponics was more than 85 in constant hydroponic experiment (CHE) at 5 microM”
t0“Onion Plant”
Claim · model-written summary
Root concentration factor was 150 in nonconstant hydroponics at 5 microM.
- Taxon
- Onion PlantAllium cepat0
- Outcome
- Root concentration factor (RCF)e0
- Value
- 150e0
- Setting
- nonconstant hydroponic experiment (NHE)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root concentration factor (RCF) in hydroponics was more than 85 in constant hydroponic experiment (CHE) at 5 microM and 150 in nonconstant hydroponic experiment (NHE) at 5 microM”
t0“Onion Plant”
Claim · model-written summary
Maximum root concentration factor was greater at lower solution concentration.
- Taxon
- Onion PlantAllium cepat0
- Treatment
- lower solution concentratione0
- Outcome
- maximum RCF valuese0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum RCF values in the hydroponic system were greater with lower solution concentration.”
t0“Onion Plant”
Claim · model-written summary
Measured TSCF values of 0.31-0.56 were similar to predicted values of 0.43-0.78.
- Taxon
- Onion PlantAllium cepat0
- Outcome
- Transpiration stream concentration factor (TSCF) valuese0
- Direction
- relatively similare0
- Value
- 0.31-0.56e0
- Qualifier
- 0.43-0.78e0
- Comparator
- predicted valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transpiration stream concentration factor (TSCF) values in the present study (NHE only: 0.31-0.56) were relatively similar to the values with predicted values (0.43-0.78)”
t0“Onion Plant”
Claim · model-written summary
TSCF increased with higher external TNT concentration.
- Taxon
- Onion PlantAllium cepat0
- Treatment
- higher external TNT concentratione0
- Outcome
- Transpiration stream concentration factor (TSCF)e0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transpiration stream concentration factor (TSCF) values in the present study (NHE only: 0.31-0.56) were relatively similar to the values with predicted values (0.43-0.78), increasing with higher external TNT concentration”
t0“Onion Plant”
Claim · model-written summary
500 microM TNT was toxic to onion plants.
- Taxon
- onion plantAllium cepae0
- Treatment
- 500 microMe0
- Outcome
- toxice0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“500 microM was toxic to onion plant”
Claim · model-written summary
50 microM TNT was nontoxic for growth but limited transpiration.
- Taxon
- Onion PlantAllium cepat0
- Treatment
- 50 microMe0
- Outcome
- plant growthe0
- Direction
- nontoxice0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50 microM was nontoxic for plant growth but limited the transpiration rate”
t0“Onion Plant”
Claim · model-written summary
50 microM TNT limited onion transpiration rate.
- Taxon
- Onion PlantAllium cepat0
- Treatment
- 50 microMe0
- Outcome
- transpiration ratee0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50 microM was nontoxic for plant growth but limited the transpiration rate”
t0“Onion Plant”
Claim · model-written summary
5 microM TNT was nontoxic as a control.
- Taxon
- Onion PlantAllium cepat0
- Treatment
- 5 microMe0
- Outcome
- nontoxice0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“5 microM was nontoxic as control”
t0“Onion Plant”