Table 3 H2S concentrations (mg/m3) inside and outside of each dairy barn.

From: Emissions of ammonia and hydrogen sulfide from typical dairy barns in central China and major factors influencing the emissions

Cow barns

Inside

Outside

Mean

SD

CV (%)

Min

Max

Mean2

SD

CV (%)

Min

Max

M1

0.112

0.051

45.54

0.027

0.227

0.088

0.065

73.86

0.038

0.132

M2

0.128

0.047

36.72

0.034

0.156

0.035

0.014

40.00

0.044

0.053

M3

0.131

0.051

38.93

0.044

0.207

0.029

0.021

72.41

0.000

0.055

M4

0.132

0.072

54.55

0.073

0.195

0.047

0.019

40.43

0.002

0.076

M5

0.098

0.037

37.76

0.067

0.156

0.024

0.017

70.83

0.005

0.044

M6

0.151

0.063

41.72

0.091

0.177

0.022

0.011

50.00

0.000

0.055

N1

0.024

0.013

54.17

0.012

0.048

0.014

0.002

14.29

0.011

0.027

N2

0.066

0.048

72.73

0.023

0.137

0.008

0.005

62.50

0.000

0.014

N3

0.039

0.027

69.23

0.015

0.046

0.017

0.005

29.41

0.013

0.019

N4

0.056

0.021

37.50

0.041

0.075

0.013

0.01

76.92

0.001

0.024

N5

0.075

0.053

70.67

0.027

0.112

0.005

0.003

60.00

0.001

0.031

Mean(M)

0.125 a

0.054

42.53

0.056

0.186

0.041 a

0.025

57.92

0.015

0.069

Mean(N)

0.052 b

0.032

60.86

0.024

0.084

0.011 b

0.005

48.62

0.005

0.023

Mean(T)

0.092

0.044

50.87

0.041

0.140

0.027

0.016

53.70

0.010

0.048

  1. For each barn, H2S concentrations were measured at 2 outside locations (2 upwind blank areas 20 m away from the barn) and 5 inside locations (2 cow bed locations, 2 manure areas and 1 feeding alley) as indicated in Fig. 6. Each location was sampled both near the floor and at 1.5 m above the floor. Measurements were made every 2 hours for 48 hours. Letter M means a lactating cow barn, while letter N indicates a non-lactating cow barn. Means in the table were the average of all values during the experiment. Mean (M) is the average of 6 lactating barns (M1 to M6). Mean (N) is the average of 5 non-lactating barns (N1to N5). Mean (T) is the average of all 11 cow barns. a,bMeans with different letters within the same column are significantly different (P < 0.05).
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