粉状白钨酸在含聚乙烯醇的水溶液中能够形成十聚钨酸，通过紫外－可见吸收光谱、顺磁共振、ｐＨ滴定及五价钨的测定对十聚钨酸的稳定性和光致变色性质进行了研究，结果表明，十聚钨酸的还原程度与溶液的酸度有关，在较高的ｐＨ条件下形成单电子还原物种，而在较低的ｐＨ条件下则主要形成双电子还原物种． Powdered tungstic acid in polyvinyl alcohol-containing aqueous solution can form a decatungstic acid, by UV-Vis absorption spectra, paramagnetic resonance, pH titration and determination of pentavalent tungsten on the stability and photochromic deca- The results showed that the degree of reduction of decatungstic acid was related to the acidity of the solution, forming a mono-electron reduction species at a higher pH and a predominantly two-electron reduction species at a lower pH.