Pub Date : 2019-06-25DOI: 10.26091/ESRNZ.8098220.V1
M. Close, B. Humphries
A total of 165 wells were sampled as part of the 2014 national survey of pesticides in groundwater, a survey that is conducted on a four-yearly basis. The survey aims were to update the national overview of pesticides in New Zealand’s groundwater systems, to investigate temporal variation in pesticide concentrations, and to identify environmental factors associated with pesticide contamination. Samples were analysed for around 80 pesticides using gas chromatography with mass spectrometry detection. Pesticides were detected in 28 wells (17%), with two or more pesticides detected in 10 wells (6%). Pesticides were detected in wells from six of the 13 regions sampled. One well contained a pesticide (dieldrin) at a concentration greater than the maximum acceptable value (MAV) for drinking water. Twenty-one different pesticides were detected, with most concentrations being less than 0.1 mg m-3. Only four of the 51 pesticide detections exceeded a con centration of 1 mg m-3. Comparisons with earlier surveys indicate similar levels of pesticide detections in groundwater over the last 12 years, with higher levels of detections before that time. The majority of wells sampled in each national survey have not had pesticides detected; where detected, the concentrations were mostly less than 0.1 mg m-3 and, with the exception of dieldrin and terbuthylazine, less than 5% of MAVs.
{"title":"The 2014 national survey of pesticides in groundwater in New Zealand","authors":"M. Close, B. Humphries","doi":"10.26091/ESRNZ.8098220.V1","DOIUrl":"https://doi.org/10.26091/ESRNZ.8098220.V1","url":null,"abstract":"A total of 165 wells were sampled\u0000as part of the 2014 national survey of pesticides in groundwater, a survey that\u0000is conducted on a four-yearly basis. The survey aims were to update the\u0000national overview of pesticides in New Zealand’s groundwater systems, to\u0000investigate temporal variation in pesticide concentrations, and to identify\u0000environmental factors associated with pesticide contamination. Samples were\u0000analysed for around 80 pesticides using gas chromatography with mass\u0000spectrometry detection. Pesticides were detected in 28 wells (17%), with two or\u0000more pesticides detected in 10 wells (6%). Pesticides were detected in wells\u0000from six of the 13 regions sampled. One well contained a pesticide (dieldrin)\u0000at a concentration greater than the maximum acceptable value (MAV) for drinking\u0000water. Twenty-one different pesticides were detected, with most concentrations\u0000being less than 0.1 mg m-3. Only four of\u0000the 51 pesticide detections exceeded a con centration of 1 mg m-3. Comparisons with earlier surveys\u0000indicate similar levels of pesticide detections in groundwater over the last 12\u0000years, with higher levels of detections before that time. The majority of wells\u0000sampled in each national survey have not had pesticides detected; where\u0000detected, the concentrations were mostly less than 0.1 mg m-3 and, with the exception of dieldrin and\u0000terbuthylazine, less than 5% of MAVs.","PeriodicalId":35599,"journal":{"name":"Journal of Hydrology: New Zealand","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89448354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-01-01DOI: 10.1016/s0301-9322(97)80098-5
W. J. Young, J. Warburton
{"title":"Principles and practice of hydraulic modelling of braided gravel-bed rivers","authors":"W. J. Young, J. Warburton","doi":"10.1016/s0301-9322(97)80098-5","DOIUrl":"https://doi.org/10.1016/s0301-9322(97)80098-5","url":null,"abstract":"","PeriodicalId":35599,"journal":{"name":"Journal of Hydrology: New Zealand","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72962527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-01-01DOI: 10.1016/0148-9062(96)87686-8
L. Pang
{"title":"Contamination of groundwater in the Te Aroha area by heavy metals from an abandoned mine","authors":"L. Pang","doi":"10.1016/0148-9062(96)87686-8","DOIUrl":"https://doi.org/10.1016/0148-9062(96)87686-8","url":null,"abstract":"","PeriodicalId":35599,"journal":{"name":"Journal of Hydrology: New Zealand","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75947731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：