Drinking chlorinated water and congenital anomalies

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The rates of gestation loss and inborn defects are increasing. Several researches have been conducted in order to happen a valid ground behind these elevated rates, but really few experiments have tried to measure the function of imbibing H2O in these upsets.

The population of involvement encompasses births ( still and alive ) at the Saint Georges Hospital between 1 January 2011 and 31 December 2013. The neonates ‘ medical record should be available along with information about the female parent, particularly residence country and the beginning of drinkable H2O at the periconceptional period and during gestation.

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Chlorination is by far the best methods for extinguishing H2O borne pathogens. It is chiefly the add-on of Cl in assorted signifiers to the imbibing H2O. Chlorine kills the pathogens by responding with their outer membrane, which is chiefly constituted of lipoids. The byproducts of this reaction, the trihalomethanes ( THM ) , constitute a major hazard for human wellness. However, it was non until late that the ingestion of these by-products has been linked to inauspicious gestation results. Still, a batch of work is needed particularly in happening a clear association and the manner of action for these by-products. Proving that these by-products have inborn effects, along with their already proven association with GI malignant neoplastic disease, will coerce scientists to seek for a safer manner to disinfect H2O.

In the article entitled as “ Pregnancy Loss in the RAT Caused by Bromodichloromethane ” ( Bielmeier, 2001 ) , scientists tried to measure the consequence of bromodichloromethane ( BCDM ) , which is a member of the THM household, on pregnant rats. The scientists tested the BCDM on rats for loss of gestation and for divergences in Lipo-Lutin and luteinizing endocrine ( LH ) degrees. They gave the rats doses of 0, 75, or 100mg/Kg/day of BCDM. The consequences showed that there was a full-litter reabsorption in approximately 50 % of rats that had taken the 75mg dosage, and the per centum additions to make 90 % in rats taking the 100mg dosage. Although these doses are much higher than those found in drinkable H2O, however, an association could be established.

In another article, “ Chlorination By-products and Nitrate in Drinking Water and Risk for Congenital Cardiac Defects ” ( Cedergen, 2002 ) , scientists tried to look into the being of a relationship between inborn bosom defects and maternal exposure to chlorinated H2O. They included 71,978 Swedish babies in the survey whose female parents consumed public chlorinated H2O during the periconceptional period or in early gestation. The degrees of Cl added to disinfect H2O were obtained from the municipalities ‘ H2O supplies, every bit good as physical and chemical position of the drinkable H2O. Eighty-two per centum of the take parting female parents used the municipality as their primary beginning of imbibing H2O while the remainder ( 18 % ) retrieved their imbibing H2O from private Wellss. A sum of 937 babies were born with cardiac defects, 753 ( 80.36 % ) of them their female parents was imbibing H2O from the Swedish H2O supplied, while the others ( n=184 ) were imbibing from private H2O Wellss.

Low birth weight ( LBW ) and preterm bringing might are besides inauspicious gestation results that might be related to ingestion of chlorinated H2O. The article “ Drinking H2O chlorination and inauspicious birth results in Taiwan ” ( Yang, 2004 ) , the scientists searched for a relation between imbibing chlorinated H2O and ( LWB ) or preterm bringing. The scientists used information of 182,796 births in Taiwan over a period of two old ages, and divided their sample geographically ; those whose female parents were populating in countries in which more that 95 % of the population was utilizing chlorinated H2O were considered as chlorine-exposed babies, while those populating in countries in which less than 5 % of the population was utilizing chlorinated H2O were considered chlorine-none open babies. They so defined an baby with LWB as an baby whose weight was less than 2500g, and an baby with preterm bringing as an baby who was born before the thirty-seventh hebdomad of the gestation period. The consequences showed that in chlorine-using communities, 4.51 % of neonates had LBW and 4.55 % had a preterm bringing. On the other manus, 4.52 % of births in the other communities had LWB and 3.40 % where born preterm. Therefore, there is an association between imbibing chlorinated H2O and preterm bringing, but non with LWB. Nevertheless, non all surveies approve on such a relationship, as in the article “ Fetal growing and continuance of gestation relation to H2O chlorination ” ( Jaakkola, 2001 ) . This survey was done in Norway, and the scientists gathered information of 137,145 Norse born-alive kids with the same results of involvement as the old article ( LWB and preterm bringing ) . They assessed the sum of the maternal exposure to chlorine byproducts by utilizing the H2O colour graduated table, where dark colourss inform the being of high degrees of dissolved organic C. The consequences showed that for female parents imbibing non-chlorinated H2O, 4.5 % of newborn had LWB and 6.7 % were born preterm, nevertheless, 4.7 % of newborn had LWB and 6.4 % were born preterm in the population devouring chlorinated H2O. Therefore, there is no relationship between exposure to chlorination byproducts and such inauspicious gestation results.

In another survey, entitled as “ Relation between Stillbirth and Specific Chlorination By-Products in Public Water Supplies ” ( King, 2000 ) , the scientists conducted a retrospective cohort survey on stillbirth embryos of known gestation age and of weight greater than 500g, and used normal births that occurred at the same clip as a control. The decision was that as the ingestion of THMs ( particularly bromodichloromethane ) increases, the rate of spontaneous abortion additions. This decision was based on the consequences that showed that the rate of spontaneous abortion in pregnant adult females imbibing chlorinated H2O with THM concentration less than 50µg/L was 0.33 % , while the rate additions to 0.56 % if the THM concentration was 100µg/L.

As it is clear, the writers of the above articles tried to happen a relationship between imbibing chlorinated H2O and a specific gestation upset, without looking at the general image. My future research will seek to observe the relationship between imbibing chlorinated H2O and inborn abnormalcies in general, without concentrating on one anomalousness and flinging the others. Such inborn abnormalcies may be nervous, respiratory, and even urinary in add-on to the old studied results. The future research should happen a more specific manner of mensurating the sum of Cl byproducts since the H2O colour graduated table that is used in most of the above articles is non specific to the THMs, but to all organic molecules dissolved in H2O.

Keywords: Chlorination, disinfection byproducts, imbibing H2O, inborn abnormalcies, gestation loss, low birth weight, spontaneous abortion.


  • Bielmeier S. , Best D. ( 2001 ) . Pregnancy Loss in the Rat caused by bromodichloromethane. Toxicological Sciences, 59, 309-315.
  • Cedergren M. , Selbing A. ( 2002 ) . Chlorination By-products and Nitrate in Drinking Water and Risk for Congenital Cardiac Defects. Environmental Research, 89, 124-130.
  • Jaakkola J. , Magnus A. ( 2001 ) .Foetal growing and continuance of gestation relation to H2O chlorination. Occupational Environment, 58,437-442.
  • King W. , Dodds L. , Allen A. ( 2000 ) . Relation between Stillbirth and Specific Chlorination By-Products in Public Water Supplies. Environmental Health Perspectives, 108, 883-886.
  • Yang C. ( 2004 ) . Drinking Water chlorination and inauspicious birth results in Taiwan. Toxicology, 198, 249-254.

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Drinking chlorinated water and congenital anomalies. (2017, Jul 10). Retrieved from


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