TWO TESTS FOR THE DETECTION OF VOLATILE ORGANIC ACIDS AND FORMALDEHYDE
JINPING ZHANG, DAVID THICKETT, & LORNA GREEN
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SOURCES OF MATERIALSChromotropic acid:
Sigma Chemicals Co. Ltd., Fancy Rd., Poole, Dorset BH17 7BR, EnglandAll other chemicals, Analar Grade:
Merck Ltd., Merck House, Poole, Dorset BH15 1TD, EnglandThe modified ground glass stopper with suspended
reaction dish (fig. 1) is no longer manufactured in the United Kingdom and has to be made specially.
JINPING ZHANG received an honors degree in microbiology from Shandong University, China, in 1982. He is technical director of Shishong Decorating Materials, Ltd., and he worked in the Conservation Laboratory of the Museum of Chinese Revolution, Beijing, until 1992. From October 1989 to August 1990 he was an intern in the British Museum Department of Conservation, where he undertook the initial work on the iodide-iodate test under the guidance of Vincent Daniels. After his return to China, he began to develop the chromotropic acid test for use in conservation (at the same time as work on this test was independently in progress at the British Museum). He is currently working on second-generation acrylic adhesives and on nonsolvent resin systems, for which he has filed patent applications. Address: No. 6, Suite 1, No. 8 Gong Yuan West St., Jian Guo Men Nei St., Beijing, 100005, PR China.
DAVID THICKETT received an honors degree in natural sciences from Cambridge University in 1988. He carried out research for two years in the ceramics industry and joined the Conservation Research Section of the British Museum Department of Conservation in 1990. He conducts testing of materials for storage and display purposes. His current research includes consolidants for degraded amber and methods of removal of polyethylene glycol wax from stone.Address: Department of Conservation, British Museum, London WC1B 3DG, England.
LORNA GREEN received an honors degree in chemistry from London University in 1984. After one year of academic research, she joined the Conservation Research Section of the British Museum Department of Conservation. She has a continuing interest in problems associated with display and storage materials and other environmental concerns. At present, she is conducting research on the storage of iron. Address: Department of Conservation, British Museum, London WC1B 3DG, England.