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首页> 外文期刊>Environmental toxicology and chemistry / >Quantifying the Root‐to‐Shoot Transfer of 4,4?‐Methylenedianiline Using Pressure Chamber and Intact Plant Methods
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Quantifying the Root‐to‐Shoot Transfer of 4,4?‐Methylenedianiline Using Pressure Chamber and Intact Plant Methods

机译：Quantifying the Root‐to‐Shoot Transfer of 4,4?‐Methylenedianiline Using Pressure Chamber and Intact Plant Methods

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The high‐production‐volume chemical 4,4?‐methylenedianiline (4,4?‐MDA) is an aromatic amine used to manufacture4,4?‐methylenedianiline diisocyanate for polyurethane production. Based on 4,4?‐MDA's octanol/water partition coefficient(K_(OW)) and correlations with the transpiration stream concentration factor (TSCF), significant plant uptake and root‐toshoottransfer are predicted. However, most correlations between KOW and TSCF were developed for neutral organics andmay not be applicable for ionizable bases such as 4,4?‐MDA. To investigate, TSCF values for 4,4?‐MDA were measured usingpressure chamber and intact plant approaches for tomato, soybean, and wheat (intact plants only). ~(14)C‐labeled 4,4'‐MDA wasused to increase analytical sensitivity and facilitate measurement of distribution within plant tissues. The TSCF of ~(14)C‐MDAdetermined using the pressure chamber method was 0.04 ± 0.00 for tomato and 0.17 ± 0.10 for soybean. These values werelower than predicted from log KOW and within the range of values for ~(14)C‐pyrene also measured in our study (0.14 ± 0.00 fortomato and 0.16 ± 0.09 for soybean). The TSCF values calculated from measurements made from intact plants grown tomaturity were statistically equivalent to those obtained from the pressure chamber method for soybean and tomato. Thedistributions of ~(14)C within the three plants species were similar, with the roots > leaves ≈ stems > fruit. The log root concentrationfactors for 4,4?‐MDA ranged from 3.68 to 4.33 for the three plant species. This finding indicates that the aromaticamine sorption to root materials is much greater than would be predicted based on its log KOW and may be the reason forthe limited root‐to‐shoot transfer observed in the pressure chamber and intact plant studies.

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