从废彩色摄影液中回收银

已经用碱法,酸法和过氧化氢法等不同方法处理,从含有相当于10.2公斤/米~3银的废摄影液中回收金属银。从中发现酸法最有前途。在处理过程中,废液被酸化至pH为3.6,此时,难溶银淤泥开始沉淀。在980℃时经热分解,从这种银渣中产生金属银。所得金属很纯(按重量计可达99.8%的银),由于方法简单,银产量高,故成本低。

腺样体肥大儿童分泌性中耳炎鼻窦炎的CT表现及其相关性

【目的】探讨腺样体肥大儿童伴分泌性中耳炎、鼻窦炎的CT表现及其相关性。【方法】对105例经临床手术病理证实为腺样体肥大且术前进行鼻咽部CT扫描(同时具有鼻窦炎或/和分泌性中耳炎)的临床影像学资料进行回顾性分析,根据腺样体肥大程度分为两组:中度肥大和重度肥大。分析两组间分泌性中耳炎和鼻窦炎发病率的差异性及影像学特征。【结果】中度肥大组CT表现为:上颌窦炎24例,筛窦炎17例,额窦炎3例,蝶窦炎例7例,鼻甲肥大30例,外耳道炎7例,鼓室炎23例,乳突窦炎23例;重度肥大组CT表现为:上颌窦炎46例,筛窦炎43例,额窦炎11例,蝶窦炎14例,鼻甲肥大44例,外耳道炎21例,鼓室炎44例,乳突窦炎44例。71%同时合并有鼻窦炎、分泌性中耳炎。【结论】腺样体肥大与分泌性中耳炎和鼻窦炎发病率呈正相关。重度肥大组分泌性中耳炎及鼻窦炎发病率明显高于中度肥大组,双侧发病率高于单侧。

Computerized tomography pleurography: a new method for detecting minor pleural lesion

Objectives To evaluate the ability of CT pleurography (CTP) in detecting minor pleural lesions in patients with pleural effusion and to assess its value in distinguishing malignant from benign pleural lesions. Methods A prospective study of 50 patients with pleural effusion was conducted using conventional CT and CTP. CT scan was run after injecting an appropriate amount of contrast medium into the pleural cavity. Results In 24 patients, all lesions detected by conventional CT were demonstrated by CTP. In 13 of 24 patients, CT pleurography detected additional lesions. In 20 of 26 patients with negative findings on conventional CT, CTP was capable of demonstrating the presence of pleural lesions. The sensitivity, specificity and accuracy of detecting pleural lesions were 25%, 100% and 30% for conventional CT, 86%, 100% and 87% for CTP, respectively. Conclusion CTP is superior to conventional CT in detecting and for the differential diagnosis benign and malignant pleural lesions.