ＴＢＴ調査結果 [水　質] （平成２～８年度）

表8 トリブチ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）

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
調査地点	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																			nd	nd	nd
八郎湖	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
仙台湾	0.018	0.011	0.004	0.006	nd	nd	nd	nd	nd	0.005	nd	nd	nd	0.007	nd	nd	nd	nd	nd	nd	nd
小名浜港	0.009	0.007	0.009	0.006	0.008	0.009	0.005	0.01	nd	0.003	nd	0.007	0.004	0.005	nd	nd	nd	nd	nd	0.005	nd
霞ケ浦	nd	nd	nd	nd	0.004	0.003	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
市原・姉崎海岸	0.045	0.051	0.042	0.017	0.011	0.016	0.003	0.003	0.003	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
花見川河口																nd	nd	nd	nd	nd	nd
隅田川河口	0.012	0.012	0.014	0.016	0.028	0.015	0.004	0.004	0.004	0.005	0.006	0.005	0.008	0.007	0.005	0.005	0.005	0.006	0.005	0.004	0.004
東京湾中瀬	0.009	0.012	0.009	0.003	nd	0.015	nd	0.005	0.004	0.003	0.004	0.003	0.003	nd	0.003	0.003	0.003	nd	0.003	nd	nd
横浜港	0.027	0.033	0.046	0.018	0.003	0.018	0.012	0.008	0.006	0.004	0.004	0.004	nd	0.005	0.003	0.004	0.003	nd	0.004	nd	0.003
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	0.03	0.015	nd	nd	0.005	nd	0.034	0.004	nd	0.005	nd	nd	nd	0.005	nd	0.01	nd	nd	nd
清水港	0.003	0.007	0.008	nd	nd	nd	nd	0.007	nd	nd	nd	nd	0.005	0.005	nd	nd	nd	nd	0.005	nd	nd
名古屋港	0.005	0.005	0.004	0.005	0.008	0.004	0.004	0.004	0.003	0.009	nd	nd	0.006	0.003	0.004	nd	nd	nd	nd	nd	nd
四日市港	0.021	-	-	0.01	0.01	0.008	0.014	0.011	0.016	0.006	0.007	0.006	0.025	0.01	0.01	0.006	nd	0.008	0.003	0.004	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	0.014	0.009	0.007	0.003	nd	nd	0.006	0.003	0.006	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
大和川河口	-	-	-	0.005	0.005	0.007	0.022	0.024	0.007	nd	0.004	0.005	nd	nd	nd	nd	nd	nd	nd	nd	nd
大阪港	0.02	0.02	0.02	0.067	0.037	0.062	0.067	0.037	0.062	0.019	0.014	0.014	0.006	0.006	0.006	0.01	0.011	0.013	0.008	0.011	0.008
姫路沖	0.014	0.013	0.013	nd	nd	nd	nd	nd	nd	-	-	-	nd	nd	nd	0.042	0.016	0.018	nd	0.005	0.009
水島沖	0.011	0.008	0.015	0.013	0.008	0.008	0.005	0.011	0.009	0.027	0.013	0.013	-	-	-	nd	nd	nd	nd	nd	nd
呉港	0.016	0.024	0.012	0.014	0.013	0.028
広島湾							nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
徳山湾	0.005	0.004	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				0.012	0.004	0.004	0.083	0.084	0.08	0.044	0.047	0.049	nd	nd	nd	nd	nd	nd	nd	0.003	nd
高松港	0.025	0.027	0.023	0.034	0.048	0.024	0.014	0.0014	0.005	0.011	0.011	0.007	0.009	0.004	0.004	0.004	0.004	0.006	0.012	0.014	0.003
四万十川河口	-	-	-	-	-	-	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
洞海湾	0.048	0.029	0.049	0.015	0.02	0.012	0.007	0.011	0.014	0.006	0.006	0.01	0.006	0.022	0.007	0.017	0.013	0.018	0.006	0.005	0.01
博多湾	0.01	0.009	0.012	0.006	0.008	0.007	0.026	0.028	0.012	0.02	0.025	0.017	0.006	0.005	0.006	nd	nd	nd	nd	nd	nd
大牟田沖	0.004	0.004	0.004	0.013	0.027	0.027	-	-	-	nd	nd	nd	0.03	nd	nd	0.04	0.01	0.01	0.004	0.003	0.004
伊万里湾							0.032	0.019	0.008	0.007	0.008	0.007	0.01	0.013	0.01	0.007	0.005	0.005	-	-	-
長崎港	0.04	0.02	0.04	0.014	0.011	0.008	0.003	0.003	nd	nd	nd	nd	nd	nd	nd	nd	nd	0.003	nd	nd	nd
大淀川河口	0.016	0.005	0.004	0.013	0.011	0.015	0.004	nd	nd	nd	0.003	nd	0.003	nd	nd	0.013	nd	nd	0.006	0.003	nd
五反田川五反田橋	nd	nd	nd	0.003	0.003	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd	nd
統一検出限界値		0.003			0.003			0.003			0.003			0.003			0.003			0.003
検出頻度		62/79			60/93			52/99			42/99			35/99			31/105			27/105
最大値		0.051			0.067			0.084			0.049			0.03			0.042			0.014
最小値		nd			nd			nd			nd			nd			nd			nd
幾何平均		0.0088			0.0057			0.0044			0.0032			0.0029			0.0025			0.0021

注１ : ＴＢＴＯ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。