Pub Date : 1906-02-01DOI: 10.1093/INFDIS/3.SUPPLEMENT_2.S109
A. Kimberly, M. Roberts
One of the most conspicuous recent advances made in sewage analysis in this country may be said to be the development of a direct process for the determination of the nitrogen as ammonia.1 The greater simplicity of the technique, the greater economy of time effected by the elimination of distillation, and the relatively greater accuracy of the process are salient advantages of the direct method which surely cannot fail to be of moment in the routine work of sewage laboratories. To be able to apply a direct process to the determination of the ammonia formed in the determination of total organic nitrogen by the Kjeldahl process seemed the next step toward greater simplicity and rapidity of execution. During a considerable portion of the work at Columbus a direct process was in daily use for the determination of the nitrogen as ammonia, and a more intimate knowledge was gained of local conditions as to the disturbing factor of turbidity, to which, as we all know, has been chiefly due the indifferent success attending earlier attempts at the direct nesslerization of the acid digestate of the Kjeldahl process. Under such circumstances it was thought that a direct method for determinating nitrogen by the Kjeldahl process might be successfully developed. Working along lines by which a direct process for the determination of the nitrogen as free ammonia was successful under such unusually hard water conditions as prevailed at Columbus, a method was finally obtained by which the disturbing turbidity was completely eliminated. It is our purpose to discuss the several factors which have to do with the turbidity occurring in nesslerized tubes, and further to describe a direct method for determination of nitrogen by the Kjeldahl process, found applicable under Columbus condi-
{"title":"A Method for the Direct Determination of Organic Nitrogen by the Kjeldahl Process.","authors":"A. Kimberly, M. Roberts","doi":"10.1093/INFDIS/3.SUPPLEMENT_2.S109","DOIUrl":"https://doi.org/10.1093/INFDIS/3.SUPPLEMENT_2.S109","url":null,"abstract":"One of the most conspicuous recent advances made in sewage analysis in this country may be said to be the development of a direct process for the determination of the nitrogen as ammonia.1 The greater simplicity of the technique, the greater economy of time effected by the elimination of distillation, and the relatively greater accuracy of the process are salient advantages of the direct method which surely cannot fail to be of moment in the routine work of sewage laboratories. To be able to apply a direct process to the determination of the ammonia formed in the determination of total organic nitrogen by the Kjeldahl process seemed the next step toward greater simplicity and rapidity of execution. During a considerable portion of the work at Columbus a direct process was in daily use for the determination of the nitrogen as ammonia, and a more intimate knowledge was gained of local conditions as to the disturbing factor of turbidity, to which, as we all know, has been chiefly due the indifferent success attending earlier attempts at the direct nesslerization of the acid digestate of the Kjeldahl process. Under such circumstances it was thought that a direct method for determinating nitrogen by the Kjeldahl process might be successfully developed. Working along lines by which a direct process for the determination of the nitrogen as free ammonia was successful under such unusually hard water conditions as prevailed at Columbus, a method was finally obtained by which the disturbing turbidity was completely eliminated. It is our purpose to discuss the several factors which have to do with the turbidity occurring in nesslerized tubes, and further to describe a direct method for determination of nitrogen by the Kjeldahl process, found applicable under Columbus condi-","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"31 Pt 2 1","pages":"109-22"},"PeriodicalIF":0.0,"publicationDate":"1906-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/INFDIS/3.SUPPLEMENT_2.S109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61381229","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 : 1906-02-01DOI: 10.1093/INFDIS/3.SUPPLEMENT_2.S151
G. C. Whipple, A. Mayer
The values given for the solubility of calcium carbonate by the different authorities quoted in Comey's Dictionary of Chemical Solubilities1 vary from 10 to 113 parts per million. About one-half of these authorities give values of more than 50 parts per million, but the high figures represent chiefly the results of early experiments, and are evidently erroneous. The figures which appear to be most reasonable may be divided into two groups, one placing the solubility between 20 and 36 parts per million, the other, between 10 and 16 parts per million. TABLE 1.
{"title":"The Solubility of Calcium Carbonate and of Magnesium Hydroxide and the Precipitation of these Salts with Lime Water.","authors":"G. C. Whipple, A. Mayer","doi":"10.1093/INFDIS/3.SUPPLEMENT_2.S151","DOIUrl":"https://doi.org/10.1093/INFDIS/3.SUPPLEMENT_2.S151","url":null,"abstract":"The values given for the solubility of calcium carbonate by the different authorities quoted in Comey's Dictionary of Chemical Solubilities1 vary from 10 to 113 parts per million. About one-half of these authorities give values of more than 50 parts per million, but the high figures represent chiefly the results of early experiments, and are evidently erroneous. The figures which appear to be most reasonable may be divided into two groups, one placing the solubility between 20 and 36 parts per million, the other, between 10 and 16 parts per million. TABLE 1.","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"31 Pt 2 1","pages":"151-65"},"PeriodicalIF":0.0,"publicationDate":"1906-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/INFDIS/3.SUPPLEMENT_2.S151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61381277","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 : 1906-02-01DOI: 10.1093/infdis/3.Supplement_2.S214
F. Slack
The bacteriological examination of milk is rapidly becoming one of the essentials in the maintenance of public health. For years milk supplies have been inspected and tested to chemical standards alone, with the result that watered, adulterated, and preserved milks have been practically driven from the markets. These chemical tests are necessary, and only fail in that they do not go far enough, since a milk impure and unwholesome on account of bacterial growth, or a milk from a diseased animal, cannot be detected by them. The bacterial count and the microscopical examination of the milk sediment reveal whether the milk has been properly handled or not, and, to a great extent, the condition of the animal from which it came.
{"title":"Methods of Bacteriological Examination of Milk.","authors":"F. Slack","doi":"10.1093/infdis/3.Supplement_2.S214","DOIUrl":"https://doi.org/10.1093/infdis/3.Supplement_2.S214","url":null,"abstract":"The bacteriological examination of milk is rapidly becoming one of the essentials in the maintenance of public health. For years milk supplies have been inspected and tested to chemical standards alone, with the result that watered, adulterated, and preserved milks have been practically driven from the markets. These chemical tests are necessary, and only fail in that they do not go far enough, since a milk impure and unwholesome on account of bacterial growth, or a milk from a diseased animal, cannot be detected by them. The bacterial count and the microscopical examination of the milk sediment reveal whether the milk has been properly handled or not, and, to a great extent, the condition of the animal from which it came.","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"31 Pt 2 1","pages":"214-22"},"PeriodicalIF":0.0,"publicationDate":"1906-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/infdis/3.Supplement_2.S214","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61381326","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 : 1906-02-01DOI: 10.1093/INFDIS/3.SUPPLEMENT_2.S223
H. Hill
{"title":"Suggestions for Changes in the Schedules for Making Broth, Gelatin, and Agar, Recommended in the Last Report of the Committee on Standard Methods of Water Analysis.","authors":"H. Hill","doi":"10.1093/INFDIS/3.SUPPLEMENT_2.S223","DOIUrl":"https://doi.org/10.1093/INFDIS/3.SUPPLEMENT_2.S223","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"31 Pt 2 1","pages":"223-5"},"PeriodicalIF":0.0,"publicationDate":"1906-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/INFDIS/3.SUPPLEMENT_2.S223","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61381356","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":"The Way to Stamp out Malarial Fevers.","authors":"E Lamicq","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 1","pages":"102-9"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222469/pdf/pubhealthpap00003-0106.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28306256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Prophylaxis of Paludic Diseases.","authors":"J Brena","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 1","pages":"112-8"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222478/pdf/pubhealthpap00003-0116.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28303314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The \"Mal del Pinto\" from a Hygienic Point of View.","authors":"J G Uruena","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 1","pages":"219-22"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222473/pdf/pubhealthpap00003-0224.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28304170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Report on the Condition and Prospects of Vital Statistics in the United States.","authors":"C L Wilbur","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 1","pages":"294-310"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222447/pdf/pubhealthpap00003-0299.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28304181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Observed Relations between Dissolved Oxygen, Carbonic Acid and Algae Growths in Weequahic Lake, Newark, N. J.","authors":"H B Baldwin, G C Whipple","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 2","pages":"167-82"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222373/pdf/pubhealthpap00004-0176.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28304205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Observations on the Census and Mortality Tables of the City of Mexico.","authors":"J M Ponce","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":88306,"journal":{"name":"Public health papers and reports","volume":"32 Pt 1","pages":"311-6"},"PeriodicalIF":0.0,"publicationDate":"1906-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222446/pdf/pubhealthpap00003-0316.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28304182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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