BS ISO 19635:2016 pdf download

BS ISO 19635:2016 pdf download.Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for antialgal activity of semiconducting photocatalytic materials
1 Scope
This International Standard specifies a test method for evaluating anti-algal activities in outdoor structures, specifically flat photocatalytic materials (for example, window panes and water tank glasses, films, guardrails, etc.) under irradiation of ultraviolet light. It does not include powder, granular or porous photocatalytic materials.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 27447, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for antibacterial activity of semiconducting photocatalytic materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 photocatalyst
substance with many functions based on oxidization and reduction reactions under photoirradiation (3.3), including decomposition and removal of contaminants, deodorization, antibacterial actions, and prevention of fouling
3.2 photocatalytic materials
materials in which or on which the photocatalyst (3.1) is added by coating, impregnation, mixing, etc.
Note 1 to entry: Photocatalytic materials are to be used for building and road construction materials to obtain the above-mentioned functions.
3.3 photoirradiation
irradiation of UV light at wavelength 300 nm to 380 nm
3.4 antialgal activity
activity in suppressing growth of algae over a material surface
3.5 photocatalytic antialgal treatment
support of a photocatalyst (3.1) by means of various methods, including coating, impregnation, blending,and others, for utilization of the antialgal activity of a photocatalyst
6.1 Transplantation and cultivation of algae
The Chlorella to be tested shall be transplanted aseptically in the clean bench or in an environment with cleanliness equivalent to that of the clean room. The test tube for base strain and that into which transplantation is to be performed shall have their cotton plug and neck wiped with absorbed cotton or gauze soaked with ethanol for disinfection and then set in the tube rack and placed in the clean bench. The test tube with base strain and that with slant medium to which the sample Chlorella is to be transplanted shall be held in one hand and the platinum loop in the other. Cotton plugs shall be removed with the other hand holding the loop, with the mouth of test tube sterilized by flame. Then, the platinum loop shall be sterilized by flame and inserted into a slant medium portion containing condensed water for thorough cooling. The cooled platinum loop shall be placed in the test tube for base strain to scrape off one loopful from the Chlorella growth surface and this amount sprayed into the new slant medium. The mouth of the test tube shall be sterilized again by flame and plugged by the cotton plug as originally. After use, the platinum loop shall be sterilized by frame. The slant medium to which Chlorella has been transplanted shall be cultivated at a temperature of 25 °C ± 1 °C and under visible light at an intensity of 5 μmol/m 2 s to 10 μmol/m 2 s (about 500 lx to 1 000 lx). When one loopful of Chlorella is to be sprayed over the slant medium, Chlorella shall be dispersed in condensed water as shown in Figure 1 and a straight line shall be drawn from there upward along the slope. An end of the platinum loop shall be lifted temporarily from the medium, immersed again in condensed air, and shall this time draw a meandering line upward along the slope. Do not use the Chlorella cultivated on slant medium for over three months.