The testing of Admiralty Disinfectant Fluid

Patterson, T. C.; Frederick, Robert C.

doi:10.1039/an9315600093

Cited by 3 publications

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“…Two methods in present use are traceable to this conitroversy: the Admiralty test, 23 in which the organic matter is gelatin and starch, materials proposed by Sommerville and WValker; and the Chick-Martin test,24 in which the organic matter is dried human faeces. Either of these additions reduces the activitv of disinfectants which are highly susceptible to the influence of organic matter, but the Chick-Martin is much the more severe, and the origin and quantity of the organic matter used are both more appropriate.…”

Section: Tests Of Excremental Disinfectantsmentioning

confidence: 99%

The Laboratory Testing of Disinfectants

Garrod¹

1935

BMJ

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Section: Tests Of Excremental Disinfectantsmentioning

confidence: 99%

The Laboratory Testing of Disinfectants

Garrod¹

1935

BMJ

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A photometric method for the comparative evaluation of disinfectants

Needham¹

1947

J. Hyg.

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1. Attention is called to the widespread dissatisfaction with the standard of reproducibility attained with the existing disinfectant tests.2. It is suggested that this lack of reproducibility is inherent in any 100% mortality test.3. The trend in all recent disinfectant developments appears to be towards greater specificity than was the case with the older products.4. Where a comparison is being made to ascertain the true relative efficiency of two or more disinfectants, this possible specificity necessitates their examination under a wider range of conditions than has been catered for in the past.5. A technique is suggested for use in those cases where a more limited examination will provide all the information that is required. It employs a simple culture medium, uses a measured quantity for the transfer from the medication tube, and makes use of a compensated photo-electric circuit to determine the amount of growth produced by the organisms which have survived the contact with the disinfectant.I wish to acknowledge my grateful thanks to the directors of Messrs Cooper, McDougall and Robertson Ltd. for permission to publish this paper, and to my colleagues of the Cooper Technical Bureau for assistance in various directions.

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The Testing of Disinfectants in the Presence of Organic Matter

Garrod

1935

J. Hyg.

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IT is now almost universally recognised that a test for disinfectants which is to yield results of direct practical significance must include appropriate "organic matter" in the test mixture. Some types of disinfectant, notably those which act by liberating chlorine or oxygen, are greatly reduced in activity by the addition of only small quantities of any extraneous material with which these elements can combine. Other disinfectants are more resistant to this influence; they are capable of efficient action in the presence of excreta and dirt of other kinds if used in adequate concentration. What this concentration should be under such unfavourable conditions it is necessary to determine, since the degree of interference is not the same for all disinfectants even in the same class, and no constant relationship exists between efficiency under these conditions and that displayed in a medium of distilled water as determined by the Rideal-Walker test. Numerous efforts have been made in the past to introduce tests employing adequate amounts of complex organic matter; few of these have achieved permanence and none popularity. The following short survey of past work is concerned only with what may be termed "excremental" disinfectants; the testing of surgical disinfectants, which may reasonably be held to demand different methods, is outside the scope of this paper. PREVIOUS TESTS EMPLOYING ADDED ORGANIC MATTERThe history of modern disinfectant testing dates from 1903, when the older thread and garnet methods were displaced by one depending on absolute sterilisation in a purely fluid mixture. The Rideal-Walker method is the prototype of several widely used present-day tests, and its principle is one which is likely always to be employed in some form. The widespread adoption of the original Rideal-Walker method and the quotation of numerical coefficients based on it regardless of their limited significance resulted in a series of protests, and in attempts to introduce tests employing added organic matter. These proposed tests were of two kinds, those in which highly complex materials were used, such as faeces, urine and milk, and those employing comparatively simple additions such as gelatin and starch.

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The testing of Admiralty Disinfectant Fluid

Cited by 3 publications

References 0 publications

The Laboratory Testing of Disinfectants

The Laboratory Testing of Disinfectants

A photometric method for the comparative evaluation of disinfectants

The Testing of Disinfectants in the Presence of Organic Matter

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