【摘要】 用五省市五种土壤,研究了用姜黄素比色法测定土壤有效硼的条件。结果表明:最佳测定条件是:提取时微沸5分钟,回流冷却5分钟,以10%MgSO₄;/7H₂O为凝聚剂,脱水显色温度65±3℃,在上述条件下的回收率为100.4%。更多还原

【Abstract】 According to the results of curcumin method for determing soil hot water soluble boron（HWB）in five soil samples from five provinces, we suggested that the best conditions of this method were as follows; The available B was extracted by slighty boiling soil with double distilled （ 1:2 ratio ） for 5 minuts, cooling period with the cycle water for 5 minuts, 10% MgSO₄ may be used as the condense reagant, and 55 ± 3℃) for vapouring and colour-forming temperature. The results obtained also showed that, the soil HWB content in five soils was risen as the vaporing and colour-forming temperature risen to 85 ± 1℃, and the HWB content was reduced as the 1 N CaCl₂ may be used as the condensing reagant, either of their recovery of boron added to soils was not satisfactory.更多还原