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Fungicides used to protect textile materials have previously been evaluated on the basis of the rate of tensile strength loss by treated fabrics after exposure to microbiological attack. This approach has been based on the assumption that loss of tensile strength is a gradual process beginning soon after exposure. In the present paper, it is demonstrated that fabrics treated with copper 8-quinolinolate are not susceptible to microbiological attack in soil burial until most of the fungicide has been lost. It is thcrefore advocated that future attempts to prevent microbiological deterioration by fungicide treatment emphasize the study of factors influencing the permancnce of the fungicide on treated material. The method of studying the kinetics of fungicide loss is illustrated with data for residaal copper 8-quinolinolate. The loss of this fungicide theoretically appears to be a zero-order reaction, although the experimental persistence curve is slightly curvilinear.The variability that is commonly encohered in soil burial experiments with fungicide-treated fabrics is discussed. It is coiicluded that variability in tensile measurements is probably the result of the variability in fungicide content, which was observed early in the burial period. An explanation is also offered for the relationship between the slope of the deterioration curve and the variability in individual tensile strength measurements.
Fungicides used to protect textile materials have previously been evaluated on the basis of the rate of tensile strength loss by treated fabrics after exposure to microbiological attack. This approach has been based on the assumption that loss of tensile strength is a gradual process beginning soon after exposure. In the present paper, it is demonstrated that fabrics treated with copper 8-quinolinolate are not susceptible to microbiological attack in soil burial until most of the fungicide has been lost. It is thcrefore advocated that future attempts to prevent microbiological deterioration by fungicide treatment emphasize the study of factors influencing the permancnce of the fungicide on treated material. The method of studying the kinetics of fungicide loss is illustrated with data for residaal copper 8-quinolinolate. The loss of this fungicide theoretically appears to be a zero-order reaction, although the experimental persistence curve is slightly curvilinear.The variability that is commonly encohered in soil burial experiments with fungicide-treated fabrics is discussed. It is coiicluded that variability in tensile measurements is probably the result of the variability in fungicide content, which was observed early in the burial period. An explanation is also offered for the relationship between the slope of the deterioration curve and the variability in individual tensile strength measurements.
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