东京工业品交易所铂金期货主力合约收报3425日圆/克，较上一交易日下跌10日圆/克。    
以下是TOCOM 8月21日铂金期货行情:                                                
合约      昨收    开盘    最高    最低    收盘    涨跌  成交量                  
17/08月   3,445   3,450   3,450   3,441   3,441   -4      9                     
17/10月   3,442   3,439   3,439   3,437   3,438   -4      77                    
17/12月   3,440   3,447   3,447   3,433   3,436   -4      53                    
18/02月   3,439   3,446   3,455   3,427   3,432   -7      126                   
18/04月   3,437   3,438   3,450   3,424   3,426   -11     601                   
18/06月   3,435   3,438   3,450   3,419   3,425   -10     6,064                 
合计                                                      6,930                 
注:1.单位:日圆/克；成交量单位:手。                                              
2.最小价格变动单位日圆/克。