{"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}
{"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}
{"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}
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