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表9 トリフェニルスズ化合物に関する水質調査結果（平成２年度～８年度指定化学物質等検討調査より）

（単位：μg/l(ppb））
調 査 地 点 平成２年度 平成３年度 平成４年度 平成５年度 平成６年度 平成７年度 平成８年度
検体１ 検体2 検体3 検体１ 検体2 検体3 検体１ 検体2 検体3 検体１ 検体2 検体3 検体１ 検体2 検体3 検体１ 検体2 検体3 検体１ 検体2 検体3
石狩川河口 - - - nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
堤川河口                                     tr(0.009) nd nd
八郎湖 nd nd nd - - - nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
仙台湾 nd nd nd nd nd nd nd nd nd nd nd 0.011 0.005 0.01 nd nd nd nd nd nd nd
小名浜港 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
霞ケ浦 - - - nd 0.013 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
市原・姉崎海岸 0.006 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
花見川河口                               - - - nd nd nd
隅田川河口 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
東京湾中瀬 nd nd nd nd nd 0.014 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
横浜港 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
信濃川河口 - - - nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
諏訪湖 - - - nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
犀川河口 nd nd nd nd nd nd nd nd 0.007 nd nd nd nd nd nd nd nd nd nd nd nd
清水港 nd nd nd nd nd nd nd nd nd - - - nd nd nd nd nd nd nd nd nd
名古屋港 0.005 0.006 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
四日市港 - - - - - - - - - nd nd nd nd nd nd nd nd nd nd nd nd
琵琶湖南湖 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
宮津港 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
桂川宮前橋 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
大和川河口 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
大阪港 - - - nd nd nd - - - - - - - - - - - - nd nd nd
姫路沖 nd nd nd nd nd nd nd nd nd - - - - - - nd nd nd nd nd nd
水島沖 0.012 0.014 0.014 nd nd nd 0.006 0.008 0.007 0.008 nd nd nd nd nd - - - nd nd nd
呉港 nd nd nd nd nd nd                              
広島湾             nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
徳山湾 0.005 0.005 0.005 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
吉野川河口       nd nd nd 0.04 0.044 0.016 nd nd nd nd nd nd nd nd nd nd nd nd
高松港 nd 0.014 0.01 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
四万十川河口 - - - - - - 0.005 0.013 nd nd nd nd nd nd nd nd nd nd nd nd nd
洞海湾 0.047 0.041 0.048 0.0076 0.0088 nd - - - nd nd nd 0.006 0.007 - - - - nd nd nd
博多湾 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
大牟田沖 nd nd nd - - - - - - - - - - - - - - - nd nd nd
伊万里湾             nd nd nd nd nd nd nd nd nd - - - nd nd nd
長崎港 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
大淀川河口 nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd nd
五反田川五反田橋 nd 0.01 0.02 nd nd nd nd 0.006 nd nd nd nd nd nd nd nd nd nd nd nd nd
統一検出限界値 0.005 0.005 0.005 0.005 0.005 0.005 0.01
検 出 頻 度 16/75 4/87 10/90 2/90 4/92 0/87 0/108
最 大 値 0.048 0.014 0.044 0.011 0.01 nd tr
最 小 値 nd nd nd nd nd nd nd
幾 何 平 均 0.0034 0.0027 0.0030 0.0026 0.0026 0.0025 0.0027


注１ : ＴＰＴＣｌ換算値
注２ : ndは不検出，”-”は欠測，空欄部分では調査を行っていない。
注３ : 幾何平均値は，ｎｄを，各地点ごとの検出限界値の １／２として算出した。